About Us
The Center for Lasers and Photonics (CELP) is an interdisciplinary center of excellence that combines cutting-edge technology from engineering and theoretical advances in science to create new horizons in the field of photonics science and engineering. The faculty in CELP belong to six different parent departments (EE, ME, AE, PHY, CY, and CE) and pursue research in the fields of nanobiophotonics, ultrafast optics, quantum optics and related fields. The Center has research infrastructure worth several crores funded by agencies such as DST, DRDO, CSIR, MHRD etc.
Head of Department
Prof. Pradeep Kumar K
Head, Centre for Lasers and Photonics
Phone:0512-259-7570
Email: head_ltp@iitk.ac.in / pradeepk@iitk.ac.in
Themes
- Nanophotonics, structured surfaces and quantum optics .
- Fiber and integrated optics, optical communication
- Biophotonics, imaging and spectroscopy
SCHEDULE 1.
- 0930-0945: Prologue: Introductory remarks and scheme of Research Scholar Day
- 0945-1045: Dr. Kedar Bhalchandra Khare, IIT Delhi:
- 1045-1115: Tea
- 1115-1300: Student talk session 1; Themes 1 and 2
- 1430-1600: Student talk session 2; Theme 3
- 1600-1630: Tea
- 1630-1730: Dr. K. Divakar Rao, BARC, Visakhapatnam :
Noncontact 3D optical imaging for precision metrology and biological applications
- 1730-1735: Closing remarks and vote of thanks
Invited Talks
Dr.Kedar Khare, IIT Delhi
Title: Does holographic replay provide a true 3D image?
We carefully examine the claim that holographic imaging provides a 3D image. While recording of a hologram involves transfer of information from a 3D volume to a 2D detector, the reconstruction involves starting with 2D data to get back 3D information. The dimensionality mismatch in the 3D reconstruction claim therefore appears to be troublesome since this supposedly extra information is obtained via simple linear back-propagation of the object field. We show that holographic replay is actually a transpose (rather than inverse) operation and the visual 3D reconstruction perception is actually due to the fact that our eye-brain combination has a tendency to concentrate only on sharply focused objects while ignoring diffuse background. The knowledge of the transpose property helps us to formulate a sparse reconstruction problem to generate a "true 3D" image reconstruction as we will illustrate with simulations and some initial experimental results.
K Diwakar Rao Barc, BARC, Visakhapatnam
Title: Noncontact Three-Dimensional Optical Imaging for Precision Metrology & Bio Applications
There has been continuous interest in developing optical techniques for real time 3d imaging. Optical coherence tomography (OCT) is a noncontact three dimensional imaging modality for real time imaging of highly turbid media like biological tissues with micrometer scale resolution. OCT has been successful as a rapid diagnostic tool in ophthalmology and several other nonmedical precision metrology applications are emerging. Digital holographic Microscopy (DHM) is another three dimensional optical imaging technique for label free quantitative phase imaging of microscopic objects & surfaces with nanometric precision. DHM is finding numerous applications in biomedicine, metrology etc. In this talk OCT& DHM will be discussed along with representative applications. Our recent work on developing low cost portable DHM system and aberration compensation in DHM by novel defocus hologram method will also be presnted.
Student Presentations
Dhananjoy De
Theme: Nanophotonics, structured surfaces and quantum optics .
Topic of Presentation: Polarization sensitive mode coupling in optical nanocavities.
Active control of mode coupling in metal-dielectric-metal (MDM) based optical nanocavities is challenging. As an alternative approach, a guided mode resonator (GMR) on top of the MDM cavity can be used to control the coupling of resonant modes in a GMR-MDM structure. As the GMR grating is highly anisotropic, this coupling is polarization sensitive as well.
Nitish Kumar Gupta
Theme: Nanophotonics, structured surfaces and quantum optics .
Topic of Presentation: Direct Determination of Photonic Bandgap Character in Topological Photonic Crystals
The importance of quantized invar-iants is paramount in topological studies, as they not only characterize the global to-pology but keeping track of their evolution also allows us to capture the ex-otic phase transition phenomena. Howev-er, when it comes to the experi-mental determination of topological in-variants and the ensuing ascer-tainment of the topological character of bandgaps, predominantly, we rely on the bulk-boundary correspondence prin-ciple and the limited information it provides. Breaking free from such limitations, we have devised an alternate methodology for direct experimental determination of the topological character of photonic bandgaps, which will be the sub-ject of this talk. We will see that in the case of spatially inversion sym-metric one-dimensional photonic crystals, one can resort to the standard op-tical measurement technique of spectro-scopic ellipsometry, and the in-equivalent topological character of stopbands can be captured in terms of the parametric variations of ellipso-metric phase angle. Specifically, I will demonstrate that depending upon the underlying bulk topological character, the band-edges engender topologi-cally robust phase singularities corresponding to the zeros of the complex reflection ratio in the angular dispersion space.
Deeksha S Jachpure
Theme: Fiber and integrated optics, optical communication
Topic of Presentation: Non-linear optics with Erbium-doped fiber
Erbium-doped fiber is the building block of optical communication today but it has not been explored sufficiently for its nonlinear optical characteristics. One property studied here is saturable absorption. This is wavelength dependent and also dependent on the length of erbium doped fiber. The consequence of this is a nonlinear performance of the fiber laser made with erbium doped fiber as the gain medium, under specific conditions. This feature of optical bistability of fiber laser will also be discussed.
Moirangthem Bikramjit Singh
Theme: Nanophotonics, structured surfaces and quantum optics.
Topic of Presentation: Identifying the Quantum States of Light Using Statistical Measurement
In this study, we investigate the use of the interaction of light with a two-level atom to determine the quantum state of light. By measuring the excitation state population, we analyze the average, variance, and skewness to gain insights into the characteristics of the quantum state of light. We use the Jaynes-Cumming model as the model system to analyze the dynamics of the light-matter interaction. We believe that this will have important application in Quantum Computing and Quantum Information
Shivam Shukla
Theme: Biophotonics, imaging and spectroscopy
Topic of Presentation: Testing and validation of a smartphone based fluorescence spectroscopic device for cervical precancer detection
A 3D printed smartphone based device has been designed, fabricated and tested on cervix samples for precancer detection. This device collects polarised fluorescence and polarised elastic scattering spectra from cervix and extracts intrinsic fluorescence spectra. A Random Forest based multi class algorithm has been utilised for classification purpose.
Subhajit Chakraborty
Theme: Biophotonics, imaging and spectroscopy
Topic of Presentation: Quality Measurements of Alcohol-Based Hand Sanitizers: A Photothermal Spectroscopic Approach
Hand sanitizers have become a part of our daily life during post Covid-19 pandemic. The main components of these sanitizers are generally alcohols, and for a hand sanitizer to work properly as a disinfectant, the alcoholic content in the hand sanitizer should be above a critical limit. Because of the heavy demand for these sanitizers, their quality is often compromised by reducing the alcoholic quantity in the solution. Quality control is essential to ensure that consumers are buying and using products that have virucidal activity against COVID-19, as the efficacy of an ABHS is dependent on its alcohol concentration. We propose femtosecond pulse induced thermal lens spectroscopy as a simple yet effective technique for evaluating the efficacy of alcohol-based hand sanitizers. In our experiments, the hand sanitizer was diluted with water to reduce the amount of alcohol in the mixture, and then Photothermal measurements were performed. The Thermal Lens (TL) signal of the solvent is capable of detecting changes in the mixture's alcohol concentration. Our technique, therefore, emerges as a sensitive tool for quality testing of alcohol-based hand sanitizers.
Bhaswati Singha Deo
Theme: Biophotonics, imaging and spectroscopy
Topic of Presentation: External attention based deep neural network model for reliable detection of oral cancer from histopathological images
Oral cancer is among the most serious cancers in the world and has a variety of morphological features, making it challenging to manually classify accurately. However, the conventional diagnostic techniques employed by medical professionals can be laborious and error prone. Hence, computer-assisted histopathological image classification is crucial for the early diagnosis of oral cancer. We propose an image classification model known as External Attention Transformer model based on the external attention mechanism to extract distinguishing subtle features from tissue sections containing oral cancer and their normal counterparts. We have used 4946 oral histopathological images classified into two categories: normal and oral squamous cell carcinoma (OSCC). Of the total images, 2435 of them are categorized as normal and 2511 as OSCC. External attention based deep neural network model attained 96.97% classification accuracy. Sensitivity and specificity were recorded as 97.61% and 96.41% respectively. It is found that the effectiveness of artificial intelligence methods for classifying oral cancer has significantly improved in comparison to leading edge methods, and this has a potential for early oral cancer detection.
Devendra Singh
Theme: Biophotonics, imaging and spectroscopy
Topic of Presentation: Chaotic cavity design of a UV-C disinfection chamber for uniform radiation distribution Theme: Biophotonics and imaging
UV-C wavelength (254nm) is used in disinfection chambers to sanitize water, food and various appliance of medical and food industry. For proper sterilization UV-C radiation must reach every spatial location of the chamber uniformly. In commonly available sanitization chambers with cross-section rectangular or circular, radiation dosage may vary in space and even lead to a few spaces with negligible radiation, “dark spots”. We propose and demonstrate the use of a chaotic Bunimovich stadium design chamber which ensures radiation not only uniform distributed within the chamber but also it go through region of interest from nearly all directions. Ray-tracing simulations on a chamber with shape parameters of a chaotic Bunimovich stadium shows uniform radiation distribution across the whole volume. Also, experimentally it is shown that the proposed chamber has more evenly distributed UV-C radiation than a cuboidal geometry. Therefore, this simple design is also useful for air disinfection, as conventional air ducts have “dark spots” which compromise the efficacy of the disinfection.
Garima Joshi
Theme: Nanophotonics, structured surfaces and quantum optics.
Topic of Presentation: Structured surfaces for frequency filtering and antenna gain enhancement
Structured surfaces enable the selection of electromagnetic waves of any specific frequency in reflection or transmission, due to their band-stop or band-pass characteristics. Such frequencyselective surfaces are required in the microwave domain for satellite and space antenna applications, in radar, for shielding in radomes, in defense and in bio medical fields. We discuss a few designs for frequency selective surfaces along with their simulated and measured parameters for the frequency range of GHz to THz. We present an application by integrating the structured surface with a planar antenna and demonstrate an improvement in gain and directivity of the antenna. Even as a stand-alone design, the structured surface is a good candidate for EMI shielding and frequency filtering. While some of the traditional challenges with such surfaces have been in miniaturization, narrowing the bandwidth and/or invariant performance with the angle of incidence, our results suggest interesting design variations to overcome them.
Aritra Paul
Theme: Fiber and integrated optics, optical communication
Topic of Presentation: All-SBS fiber-based setup for optical frequency comb generation utilizing a pump recycling technique and comb line isolation by implementing Brillouin amplification
We describe an all-stimulated Brillouin scattering (SBS) fiber-based setup for the generation, amplification, and isolation of frequency components from an optical frequency comb (OFC). The cascaded SBS–OFC is obtained by utilizing pump and Stokes power recycling techniques. A total of >15 comb lines within a 45 dB bandwidth, having an average power of 16 dBm, is observed in the 1550 nm wavelength region of operation. By implementing a polarizer–analyzer setup exploiting the weak birefringence in silica fibers, we amplified and isolated the first Stokes component of the generated comb. The isolated component at 1550.03 nm was amplified by ≈55 dB. In order to verify the isolation of a single comb line, the SBS–OFC is intensity modulated using sinusoidal signals of different frequencies, and the modulation is detected after the comb line isolation. We also observe that with the increase in Brillouin pump power during comb line isolation, the spontaneous Brillouin noise acts as a limitation to the selective amplification process.
Viren S Ram
Theme: Biophotonics, imaging and spectroscopy
Topic of Presentation: Fringe Pattern normalization using GANs
Fringe pattern normalization is an important preprocessing technique required during phase extraction from interferograms. However in practical experiments, it is very difficult task to perform normalization task due to presence of background illumination, noise and amplitude modulation. In order to achieve normalization, a generative deep learning approach has been proposed. Using this model, results came out to be better than the classical approaches that has been proposed earlier.
Aman Sharma
Theme: Biophotonics, imaging and spectroscopy
Topic of Presentation: Theoretical & Numerical aspect of the Time-Resolved Thermal Lens using Gaussian Beam.
A general study of the thermal lens process for the time-resolved method is presented. Considering all the optical and thermal parameters in the analytical analysis and numerical simulation a comparison has been done. Heat generation and the induced thermal phase shift in the presence of convection have been calculated for the time-resolved studies. Analytical and numerical studies have been further extended for the Power dependence studies, pump beam spot size effect, and Sample Length Limitations for the three cases, single beam effect & dual beam with the same wavelength, and dual beam different wavelength Effects. The quantitative discussion also addresses the convective impact, which includes the convection time and the TL strength at the convection point. The convection impact on the intensity of the probe beam with the variation of spot size, sample length, and pump power has also been addressed.
Research Scholar Day (16 May 2022)
Pictures From the Day
CELP Department Group Photograph Session Along With Dr. Shankar V.Nakhe
| Time | Speaker | Title |
|---|---|---|
| 9.10 to 9.30 am | Aritra Paul | Towards generation of flat-optical frequency comb |
| 9.30 to 9.50 am | Srinivasu Sapireddy | Switching the Structure of Light |
| 9.50 to 10.10 am | Deeksha Jachpure | Dual threshold in Lasers |
| 10.10 to 10.30 am | Soumya Kumari | Hybrid Plasmonic Ring Resonator for Bulk and Affinity Bio-sensing Applications |
| 10.30 to 10.50 am | Shivam Shukla | Design and testing of a smartphone-based spectrometer for collection of Polarized fluorescence and elastic scattering spectra form human cervix |
| 10.50 to 11.10 am | Subhajit Chakraborty | Femtosecond Laser Induced Thermal Lens for Probing Molecular Interactions |
| 12 onward | Dr. Shankar V.Nakhe | Indigenous Laser and Photonic Systems for Utilization in Nuclear Power and Societal Applications |
Inauguration and Guest Lecture
Student's Talk on their respective areas
Poster Section
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Research Scholar Day 2016
Gallery
Founded in 1916, The Optical Society (OSA) was organized to increase and diffuse the knowledge of optics, pure and applied; to promote the common interests of investigators of optical problems, of designers and of users of optical apparatus of all kinds; and to encourage cooperation among them. The purposes of the Society are scientific, technical and educational. OSA sponsors small and large meetings consisting of a technical program and an industrial exhibition appropriate to the subject matter and number of attendees. Large conferences often include professional education courses and workshops addressing the state of emerging technology and industry.
The Optical Society brings together optics and photonics scientists, engineers, educators, and business leaders. OSA's membership totals more than 16,000 individuals from over 100 countries. Approximately 49 percent of the Society's members reside outside the United States.
MISSION OF OSA
“Since 1916, working to bring together scientists, engineers, educators, technicians and business leaders in the fields of optics and photonics.”
INDIAN INSTITUTE OF TECHNOLOGY KANPUR
Student Chapter of the
OPTICAL SOCIETY OF AMERICA
(Established in year 2011)
President
Mr. Deeksha Jachpure
PhD Scholar, CELP
Vice President
Ms. Dhananjoy De
PhD Scholar, CELP
Faculty Mentor
Prof. D. Goswami
Dept. of Chemistry & CELP
Workshops & other Events
Lecture: Precision Optical Measurements -An enabling Tool for Fundamental Physics
Date: 16th May 2021 (Sun)
Time:4.00 PM (IST)
Webinar Platform: Virtual (Zoom)
Lecture: Pushing Fibre Laser Technology into the Mid Infrared:Recent breakthroughs, outstanding challenges, and the route to practical applications
Date: 18th January 2021 (Mon)
Time:4.00 PM (IST)
Webinar Platform: Virtual (Zoom)
Lecture: A decade of my work with Specialty Optical Fibers & Career pathways in Optics and Photonics
Date: 10th October 2020 (Sat)
Time:4.00 PM (IST)
Webinar Platform: Virtual (Zoom)
Lecture: Optical Tweezers
Date: 30th September 2019 (Mon)
Time: 3.30 PM (IST)
Venue: Lecture Hall Complex - L8
Lecture: Next-Generation Communications Powered by Photon-Phonon Interaction
Date: 17th August 2019 (Sat)
Time: 4.00 PM (IST) (Tea at 5.00 PM)
Venue: Lecture Hall Complex - L8
Lecture: Nonlinear spectroscopy, Absorption & Refraction
Date: 5th December 2016 (Mon)
Time: 3:00 PM (Tea at 2:45 PM)
Venue: Lecture hall complex- L8
| Date |
Speaker | Affiliation | Title of the talk |
| 25th Sep. 2021 | Dr. Sankhyabrata Bandyopadhyay | Dept. of Electrical & Electronics Engineering, City University (London) | Lecture on Optical Fiber Sensors: Opportunities, scope & challenges |
| 17th Sep. 2021 | Dr. Suchita Yadav | Dept. of Instrumentation & Applied Physics, IISc. Bengaluru | Lecture on Intermodal Stimulated Brillouin Scattering |
| 18th Jan. 2021 | Dr. Sendhil Raja S. | RRCAT | Precision Optical Measurements -An enabling Tool for Fundamental Physics |
| 18th Jan. 2021 | Dr. Robert Woodward | Toshiba Research Europe Ltd. | Pushing Fibre Laser Technology into the Mid Infrared:Recent breakthroughs, outstanding challenges, and the route to practical applications |
| 10th Oct. 2020 | Dr. Deepak Jain | Dept. of Electrical Engineering, IIT Bombay | A decade of my work with Specialty Optical Fibers & Career pathways in Optics and Photonics |
| 30th Sep. 2019 | Dr. D. Goswami | Dept. of Chemistry & CELP, IIT Kanpur | Optical Tweezers |
| 14th Aug. 2019 | Dr. Amol Choudhary | Dept. of Electrical Engineering, IIT Delhi | Next-Generation Communications Powered by Photon-Phonon Interaction |
| 9th Apr. 2019 | Ms. Garima Bawa | Dept. of Physics, IIT Kanpur | Existence of two unique wavelengths: critical and cross-over wavelengths in the transmission spectrum of directional couplers |
| 12th Mar. 2019 | Mr. Girish Kulkarni | Dept. of Physics, IIT Kanpur | Novel tools for characterizing photon correlations in parametric down-conversion |
| 25th Feb. 2019 | Mr. Sabyasachi Mukhopadhyay | TBA | Optical diagnosis of cancer and diabetic macular edema |
| 1st Feb. 2019 | Dr.Jyoti Jaiswal | Ph.D. from IIT Roorkee | Development of nanostructured thin films for laser detonator, optoelectronic and gas sensing application |
| 27th Sept. 2018 | Mr. Pavan Kumar | Dept. of Physics, IIT Kanpur | Comparison of different spectroscopic techniques for oral precancer detection on human tissue and saliva |
| 10th Aug. 2018 | Mr. Syed Tajammul Ahmad | Dept. of Electrical Engineering, IIT Kanpur | Mitigation of linear and nonlinear impairments in coherent optical OFDM system using radial basis function neural networks |
| 16th Apr. 2018 | Ms. Asha Yadav | Center for Energy, IIT Guwahati | Growth and study of optoelectronic properties of a-Si:H/nc-Si:H based superlattice structures |
| 16th Feb. 2018 | Mr. Arif Warsi Laskar | Dept. of Physics, IIT Kanpur | Probing, Quantifying and Freezing Coherence in a Thermal Ensemble of Atoms |
| 8th Nov. 2017 | Dr. Indrajeet Kumar | CELP, IIT Kanpur | Pulsed laser deposition and characterization of carbon thin films |
| 23rd Oct. 2017 | Dr.Akhilesh Kumar Mishra | Dept. of Electrical Engineering, Technion- Israel, Institute of Technology,Israel | Triggering and controlling coherence in a room temperature quantum dot semiconductor optical amplifier |
| 16th Oct. 2017 | Mr. Prince Gupta | Dept. of Physics, IIT Kanpur | Surface plasmon resonances and their interactions with molecular resonances on corrugated gold gratings |
| 12th Sept. 2017 | Dr. Venkata Ramaiah Badarla | University of Tokyo, Hongo Campus, Tokyo, Japan | Development of ultrafast optical parametric oscillators from near to mid-infrared region |
| 31st Aug. 2017 | Dr. Sudip Kumar Chatterjee | CELP, IIT Kanpur | Selective excitation of higher order modes in Gelatin-coated multilayered fiber for high relative humidity measurement |
| 29th Mar. 2017 | Prabodh Kumar Pandey | Dept. of Physics, IIT Kanpur | Photoacoustics: A song of light and body |
| 6th Feb. 2017 | Subodh Kumar Gautam | Inter-University Accelerator Centre, New Delhi | Controlled tailoring of oxide thin films by defect engineering for optoelectronic applications |
| 30th Jan. 2017 | Abhishek Anchal | Department of EE, IIT Kanpur | Optical phase conjugation and its applications in telecommunications |
| 5th Dec. 2016 | Prof.Eric W. Van Stryland | CREOL, University of Central Florida, Orlando, USA | Nonlinear spectroscopy: absorption and refraction |
| 18th Oct. 2016 | Nikhil Deep Gupta | ECE Department, MNIT Jaipur | Light Trapping in Photonic Crystal based Thin Film |
| 26th Sept. 2016 | Prof. P. K. Datta | Dept. of Physics, IIT Kharagpur | Optimised Generation of Terahertz Radiation for Phonon Spectroscopy of Doped GaSe Crystal |
| 8th Sept. 2016 | A. Kani | Dept.of Physics, IIT Kanpur | Weak-field Multiphoton excitation |
The student chapter of IIT Kanpur is committed to spreading of Optics education and disseminates Photonics knowledge through workshops, lectures and other events.
R R Dasari Lecture Series
Ramachandra Rao Dasari Distinguished Lecture Series
Late Ramachandra Rao Dasari, worked as a faculty member of Physics department of I.I.T. Kanpur for 16 years. He left IIT Kanpur in 1978.Subsequently, he worked at the National Research Council of Canada, University of British Columbia and Massachusetts Institute of Technology, USA. He passed away in Schererville, IN, U.S.A. on April 12, 2020 at the age of 87.He established the first laser laboratory in India, fabricating the lasers indigenously. This pioneering work later led to the formation of CELT at IITK which has now grown into a vibrant Centre for Lasers and Photonics (CELP) offering interdisciplinary training and research.
In order to give respect to his contributions towards IIT Kanpur and the whole world, CELP conducts lecture series every year by inviting prominent scientist in the field of photonics.More details about the lecture series click the link below:
Speaker: Dr. Naresh Chand
Affiliation:Associate Vice President, IEEE Photonics Society, NJ, USA
Topic : Advances and Opportunities in Optical Communication Networks and Systems
Date/Time : 25 October, 2022 at 4:00 PM.
Venue : Lecture Hall-15
Abstract :Today we are at the beginning of 4th industrial revolution in which Photonics in general and Optical Communication technologies in particular are the key enablers. They offer India unlimited opportunities to contribute and benefit, driving her green- economic growth towards US $5 Trillion goal by 2024. Photonics is everywhere around us. New photonics technologies, pr oduc t s and appli c a tions continue to eme rge . All emerging technologies such as IoT, artificial intelligence, virtual reality, machine learning, smart X (X could be states, cities, villages, communities, and/or homes), data centers, vehicular communications, and cloud computing rely heavily on Optical Communication Networks and Systems. This talk will discuss advances and opportunities in this field.
Biodata of Dr. Naresh Chand: Presently Dr. Naresh Chand represents IEEE Photonics Society in multiple leadership capacities. In 2019, he retired as Director from the US R&D Center of Huawei Technologies in NJ where he was working on developing low-cost advanced technologies for Ultra-Broadband Optical Access Networks since 2011. Prior to this, he worked for BAE Systems (2003-11), Agere Systems and AT&T/Lucent Bell Laboratories (1986-2003), and Dept of Electronics, Government of India (1974-79). His areas of research include optical communication systems, fiber-to-the-home, RF over fiber, non-hermetic 1300-1500 nm InP lasers, reliable high power 980 nm InGaAs/GaAs pump lasers, VCSELs, HBTs, HEMTs, QWIPs, GaAs/Si and AlGaAs/GaAs MBE. He has several firsts and world records to his credit. He has authored > 180 research papers and 15 patents (issued). He did his M.Sc. (Tech) Electronics in 1974 from BITS, Pilani with Gold Medal. From there he joined IIT Kanpur to do his PhD that he left to join Dept. of electronics, Govt. of India, where he was involved with the licensing and development of the Electronic Component industry in India. Later on a British Commonwealth Scholarship, he did his M. Eng. (1980) and Ph.D. (1983) in EE from the University of Sheffield, UK. He also did 2 years post-doctoral research at the University of Illinois, Urbana, IL. Dr. Naresh Chand is a Life Fellow of IEEE and the founder of Prakash Bharati to promote Photonics in India.
Speaker: Dr. Shankar V. Nakhe
Affiliation:Director, Raja Ramana Centre for Advanced Technology(RRCAT), Indore
Topic : Indigenous Laser and Photonic Systems for Utilization in Nuclear Power and Societal Changes.
Date/Time : 16th May 2022 at 12 P.M.
Venue : L14(Lecture Hall Complex)
Abstract :Laser after its invention is rightly described as 'a solution looking for a problem' and in real life lasers continued to provide unique and novel solutions to variety of problems for more than 5 decades. Nuclear research and power program, societal health program have imposed challenging problems. RRCAT at Indore is engaged in development of laser/photonics system developed at RRCAT and deployed in field applications in the areas of nuclear, industrial and societal health.
Biodata of Dr. Shankar V. Nakhe: Shankar V. Nakhe, Outstanding scientist, is currently Director, Raja Ramanna Centre for Advanced Technology(RRCAT), Indore. He graduated in Electrical Engineering from Walchand College in 1985 with first rank in the Shivaji University. He joined Department of Atomic Energy in 1987. He subsequently obtained M.S.(Engg. Sc.) from IISC Bengaluru. The Oriental University awarded him PhD(honoris causa) in 2021. He is the President of Indian laser Association. At RRCAT he worked on design, development of the fiber Bragg grating inscription facility at RRCAT.
Speaker: Professor Bijoy Krishna Das
Affiliation:Electrical Engineering, Indian Institute of Technology Madras
Topic : Integrated Silicon Photonics – An enabling technology for the 21st Century
Date/Time : 28th November at 10:45 A.M. (Tea will be served at 10:15 A.M.)
Venue : L15(Lecture Hall Complex)
View in Poster Format
Abstract : Silicon photonics has been considered to be one of the few enabling technologies for the 21st century. It is finding many novel applications in the area of high speed optical interconnects in semiconductor IC technology, lab-on-chip sensing, and futuristic quantum optic computation and secured communication systems. The triumph of silicon photonics technology has been possible because of the advancement of silicon CMOS technology nodes along with a little add-on for the co-integration of electronics and photonics devices. Besides hybrid integrations of III-V laser sources/detectors, waveguide-based devices like directional coupler, micro-ring resonator and Mach-Zehnder interferometer are commonly used to achieve almost all other passive and active functions. In this lecture, the speaker starts with discussion about how the electrical interconnect bottleneck in IC technology compelled semiconductor industries to re-invent integrated optics or photonics integrated circuit technology during the last two decades of the last millennium. It will then be followed by an overview of latest state-of-the-art integrated silicon photonics technology leading towards successful products for high-speed optical interconnects and many other attractive applications. Thereafter, he will present some novel silicon photonics devices and circuits recently demonstrated at IIT Madras and elsewhere in India.
Speaker : Sri. H. B. Srivastava
Affiliation : Director, LASTEC/DRDO
Topic : Lasers in Homeland Security and Defence
Date/Time : 17th August at 5:00 P.M. (Tea will be served at 04:30 PM)
Venue : L17(New Lecture Hall Complex)
View in Poster Format
Abstract : Lasers have been traditionally used in medical and industrial applications for long. The applicability of lasers in security and defence is now only gaining momentum. Non-conventional and invisible technologies are required that can detect threats, e.g. explosives, chemical and biological warfare agents. LASTEC has been experimenting with scattering and absorption based laser spectroscopy techniques to address these concerns. The talk will present the recent advances made at LASTEC in these areas. A few research areas of interest to defence scientists, which may become potential collaboration topics between LASTEC and IIT Kanpur communities, will also be presented.
Biodata of Sri. H. B. Srivastava : Shri Hari Babu Srivastava took over as Director of Laser Science and Technology Centre, Delhi on 20th June 2014. At this Centre, he has been spearheading various laser technologies ranging from high power laser sources to chem.-bio LIDARs, explosive identification, laser countermeasures, electro-optical/laser equipment and various other innovative laser applications for use in low intensity conflicts and for armed forces.
He joined DRDO in 1984 at Instruments Research and Development Establishment (IRDE), Dehra Dun, after a brief stint (1983-84) in industry at M/S Hindustan Instruments Ltd., New Delhi. He took over as Director of Electronics and Computer Science at DRDO HQs on 18th April 2013, where he was instrumental in pushing a large number of DRDO projects of national importance. He was also associated with Kota Harinarayana committee, a committee set up by the Govt. of India, for studying organizational aspects and productionization of DRDO technologies. He was re-designated as Director Tech. (Electronics and Communication Systems) on restructuring of DRDO HQ on implementation of Rama Rao Committee recommendations. He is an alumnus of IIT Roorkee and IIT Kanpur from where he obtained his B.E. and M. Tech. degrees in Electrical Engg., respectively.
SpeakerDr. Stanley E. Whitcomb
Affiliation : Affiliation:LIGO Lab(operated by Caltech and MIT)
Topic : LIGO: On the Threshold of Gravitational-wave Astronomy Science
Date/Time : 24th September at 6:00 P.M. (Tea will be served at 05:45 PM)
Venue : L4(Lecture Hall Complex)
Abstract : The Laser Interferometer Gravitational-wave Observatory is a project to develop ultra-sensitive optical interferometers for the detection and study of gravitational waves from astrophysical sources. First detections are expected in the next few years, and they will offer new information about some of the most energetic events in our universe. The challenges of using interferometry to detect gravitational waves and how LIGO is meeting those challenges will be described. In conclusion, there will be a short discussion of the importance of international networks for extracting the full potential from gravitational wave observations.
Biodata of Dr. Stanley E. Whitcomb : Dr. Stanley E. Whitcomb is currently the Chief Scientist of the Laser Interferometer Gravitational-wave Observatory (LIGO) Laboratory. The LIGO Lab is operated by Caltech and MIT through funding from the National Science Foundation.
It comprises observatories in Livingston, Louisiana and Hanford, Washington, in addition to the groups at Caltech and MIT. Over thirty years in development and construction, LIGO is expected to begin taking data at its design sensitivity by year’s end, and will be a key part of an international network of gravitational wave detectors, seeking to learn about the universe through a new type of signal. The LIGO Scientific Collaboration currently includes approximately 800 scientists, engineers and students from more than 60 institutions in 12 countries.
Professor Stan received his undergraduate education at Caltech. He had one year of graduate study at Cambridge University before completing his Ph. D at the University of Chicago in far-infrared and submillimeter astronomy. He returned to Caltech in 1980 as the assistant professor of physics, near the beginning of Caltech’s entry into the field of gravitational wave detection. Over the years since then, he has been involved in nearly every phase of the effort to build LIGO—concept development, prototype sensitivity demonstration, detector design and installation, commissioning, data analysis, and management. He is a Fellow of the American Physical Society and of the Optical Society of America.
Speaker: Prof. Kazuaki Sakoda
Affiliation: National Institute for Materials Science & Tsukuba University
Topic : Nanophotonics Studies Based on Modern Optics and Materials Science
Date/Time : 19th August at 12:00 P.M.
Venue : DA 229
Abstract : The combination of modern optics and materials science can realize a variety of novel optical phenomena that may find innovative applications.In this lecture I will review the recent achievements of such nanophotonics studies in our research group. I will focus in particular on
(1) The control of the radiation field by photonic crystals metamaterials plasmonicnano-cavities and their fabrication technologies
(2) nano-scale materials sciencelike quantum dots quantum rings isoelectronic traps and polariton nano-fibers
(3) Their applications (Purcell effect photonic Dirac cone tunable laser micro-pattern laser thermalIR source single-photon source and entangled photon-pair source).The lecture will be an introductory one for both graduate and undergraduate students.
Biodata of Prof Kazuki Sakoda :Kazuaki Sakoda is the Managing Director of the Photonic Materials Unit at the National Institute for Materials Science (NIMS), Japan. He is also a Professor in the Doctoral Program in Materials Science and Engineering at the Graduate School of Pure and Applied Sciences, University of Tsukuba.
Professor Sakoda is an engineer and scientist by training. Prior to joining NIMS as a Senior Researcher in 2002, he was a researcher at the Toray Industries Electronic and Information Materials Research Laboratory and an Associate Professor of the Hokkaido University Research Institute for Electronic Science. He was appointed Director of the NIMS Quantum Dot Center in 2007 and has been Unit Director of the Photonic Materials Unit since 2011.
Prof. Sakoda is a very well-known researcher in the area of Photonic crystals and has several seminal publications to his credit. He holds the credit of writing the first comprehensive textbook on the optical properties of photonic crystals. The book provides both introductory knowledge for graduate and undergraduate students and also important ideas for researchers in this field.
SpeakerProf. Yukihiro Ozaki
Professor, School of Science and Technology
Kwansei Gakuin University
2-1 Gakuen, Sanda, Hyogo 669-1337 Japan
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Topic SERS; its Principle and Biological Applications
Date/Time: 21st August at 5:15 PM (Tuesday)
Place: L-12
Abstract : Surface-enhanced Raman scattering (SERS) is an extraordinary candidate for detecting and characterizing biological and biomedical molecules, because Raman cross-sections of these molecules attached to Au or Ag nanostructures can be enhanced by a factor of 1010-1014. In fact, SERS has actively been applied to the nondestructive and ultrasensitive characterization of biomolecules, and has thus attracted increasing interest in the field of life sciences, including in DNA-, protein-, cell-, and bacterial studies. The enhancement originates from the near electromagnetic (EM) field or charge transfer (CT) interactions between nanostructures and the attached molecules on them. Thanks to the enhancement, detection time of SERS considerably decreases compared to conventional Raman scattering. SERS for biological and biomedical molecules generally uses near-infrared (NIR) lasers, which can reduce the risk of damaging the molecules even by applying high power. The high specificity of vibrational spectra and the sensitivity to the aqueous environment increase the significance of SERS to study living biological systems. Also SERS active nanoparticles (NPs) bring advantages of detecting or tracking different known biomolecules over fluorescent tags. The usage of such fluorescent tags suffer from confused overlapping fluorescence spectra broader than SERS spectra and non-uniform photobleaching rates, which brings us several potential complications On Ag or Au NPs, optical responses of adsorbed molecules are enhanced. It is widely known in the field of surface enhanced spectroscopy. One of the most common examples may be SERS for the researchers involved in analytical chemistry fields. The enhancement factors of SERS up to 1014 allow us to measure spectra of single molecules (SMs). Raman spectra have distinct vibrational bands known as “molecular fingerprints”, which enable us to attribute molecular species in details. Despite the significant impact of SERS in basic research, fundamental issues such as lack of conclusive evidence for validating the mechanism underlying SERS. We attempted here to resolve the issue by identifying correlations between SERS and its mechanism. There are mainly two mechanisms underlying SERS, which are based on two different mechanisms of enhancement: one is electromagnetic (EM) mechanism and another is chemical one. EM mechanism is characterized by twofold EM enhancement of Raman process induced by plasmon resonance. Chemical enhancement is characterized by shifting of Raman scattering in non-resonance to that in resonance through the formation of charge transfer complexes between adsorbed molecules and metal surface . Both mechanisms have been experimentally investigated in detail and found to be valid. Thus, in an effort to find out which mechanism is dominant, quantitative evaluation of SERS based on exclusive one mechanism is important. In the section, we focus ourselves on recent experimental investigations of EM mechanism using systems composed of single AgNP aggregates and rhodamine 6G (R6G) dye molecules. Thanks to the protection of functional groups of R6G chemical interaction between Ag surfaces and ?-electrons of R6G is weak, indicating we can expect exclusive contribution on EM mechanism to SERS in the system. Generally, there are two kinds of strategies for SERS-based detection of biological molecules. One is label-free detection and the other is Raman dye-labeled detection. Label-free detection is a method of acquiring intrinsic SERS spectra of target biomolecules. It is a simple, direct and reliable approach, but its sensitivity is not high enough in some cases especially for those biomoleculs with small Raman-cross sections. In the case of Raman-dye labeled detection, SERS spectra of extrinsic labels are used as representatives of masked target biomolecules. Recent years, lots of Raman-dye labeled NPs probes have been developed for biomolecule detection based on biomolecule-ligand interactions. It is an indirect approach with high sensitivity; however, it is not always reliable because nonspecific bindings of the ligands may cause false positive results.For some SERS-inactive biomolecules, e.g., phenolic estrogens, changing them to be SERS-active is a new idea we proposed for their detection. It is an indirect method, differing from the Raman-dye labeled strategy because the target molecules are changed to azo dyes and the SERRS spectra correspond to the target molecules. In this chapter we describe our several important strategies for the detection of proteins and other biological molecules by SERS.1. Itoh, T.; Sujith, A.; Ozaki, Y. in Frontiers of Molecular Spectroscopy, J. Laane ed. Elsevier, Amsterdam, Netherlands, 2009, p.289–320.
2. Han, X. X.; Zhao, B.; Ozaki, Y. Anal. Bioanal. Chem. 2009, 394, 1719.
3. Han, X. X.; Zhao, B.; Ozaki, Y. Trends in Anal. Chem. in press.
4. Itoh, T.; Biju, V.; Ishikawa, M.; Kikkawa, Y.; Hashimoto, K.; Ikehata, A.; Ozaki, Y. J. Chem. Phys. 2006, 124, 134708.
5. Itoh, T.; Yoshida, K.; Biju, V.; Kikkawa, Y.; Ishikawa, M.; Ozaki, Y. Phys. Rev. B 2007, 76, 085405.
6. Yoshida, K.; Itoh, T.; Biju, V.; Ishikawa, M.; Ozaki, Y. Appl. Phys. Lett. 2009, 95, 263104.
7. Yoshida, K.; Itoh, T.; Biju, V.; Ishikawa, M.; Ozaki, Y. Phys. Rev. B 2009, 79, 085419.
Speaker: Prof. P. N. Prasad
Departments of Chemistry, Physics, Electrical Engineering and Medicine
Institute for Lasers, Photonics and Biophotonics
University at Buffalo,The State University of New York
Buffalo, NY 14260-3000, US
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Topic (a): Nanophotonics: Controlling the Excitation Dynamics at Nanoscale to Impact on World Energy and Healthcare
Date/Time: March 15, 2012 at 11:15 AM (Thursday)
Place: L-6
Topic (b): METAPHOTONICS: A New Multidisciplinary Frontier
Date/Time: March 15, 2012 at 05:15 PM (Thursday)
Place: L-11
Abstract (a) Nanophotonics deals with interaction between light and matter on nanoscale 1 . Its coverage includes size dependence of optical properties in quantum-confined structures, local field enhancement due to plasmonics that leads to enhanced linear, and nonlinear optical responses, as well as nanocontrol of excitation dynamics. We are developing nanoscale inorganic, organic and hybrid materials in which phonon-induced excitation dynamics, energy transfer and nonlinear optical interactions can be controlled and photon localization can be manifested. Application of nanophotonics to two areas of global priority: solar energy conversions and 21 st century healthcare will be discussed.
For solar energy conversion, our nanophotonics approach uses hybrid nanostructures in which quatum dots are utilized to harvest photons and a polymeric medium provides a flexible large area structure with ease of processing. The emphasis is to efficiently use u.v. photons by carrier multiplication derived from multi-excitation generation as well as harvest IR photons efficiently by quantum dots and multipods of a narrow band-gap semiconductor. Our approach utilizes nanocontrol of excitation dynamics, phonon relaxation, interfacial electron transfer, electron cascading and carrier dynamics to maximize conversion of photon energy to electrical energy.
Nanophotonics application to Biophotonics in the form of Nanobiophotonics provides new approaches for 21 st century healthcare by its application to the field of nanomedicine which is generating worldwide interest 2, 3 . Nanophotonics provides optical functions for multimodal optical imaging and light controlled targeted therapy. A major opportunity is created for nanomedicine by the use of nanostructures to manipulate the optical resonances and excitations dynamics which provide novel modalities for optical imaging and light controlled therapy. An important aspect of our program is the use of nonlinear optical processes such as twophoton excitation. Control of multiphoton excitation dynamics provides approaches for light activated and optically monitored therapy. Examples provided are photodynamic therapy and gene therapy; their impact on a broad range of health care challenges covering cancer, neurological diseases, infectious diseases, addictions, obesity and depression will be discussed.
1. P.N. Prasad “Nanophotonics”, John Wiley & Sons, New York (2004)
2. P. N. Prasad “Introduction to Biophotonics”, John Wiley
3. P.N Prasad “Introduction to Nanomedicine and Nanobioengineering”, John Wiley, New York (May, 2012)
Abstract (b) Metaphotonics is a rapidly emerging new direction that deals with manipulation of electric and magnetic fields and their coupling in nanoengineered materials to control the field distribution and propagation of electromagnetic waves. The application of metaphotonics ranges from photonics communications, to solar energy harvesting, to sensor technology, to biophotonics. Metaphotonics covers a broad scope which includes:
- Chiro-Optics describes the coupling of electric and magnetic dipoles in a chiral medium. Here chiral control of both linear and nonlinear optical properties can be used for manipulation of beam propagation. Chiro-optics also provides a new chemical approach to achieve negative refraction. Our theory-guided design of novel polymeric chiral media to yield negative refractive index will be discussed, along with our more recent reports of plasmonic, structural, and excitonic enhancement of chirality. We have shown that each of these mechanisms can produce increases in chirality parameter of more than an order of magnitude; their combination should ultimately produce chirality parameter values approaching one to enable chiral negative index materials.
- Magneto-Optics describes the magnetic control of optical fields and involves cross-coupling between electric and magnetic fields. The two principal effects are Faraday rotation, and magnetic circular dichroism. Our efforts in this direction, using chiral polymer nanocomposites, will be presented. A promising direction is the use of stable organic biradicals for light harvesting, controllable reactivity, and spin valve applications.
- Magneto-Plasmonics describes hybrid materials and systems with synergistic magnetic and plasmonic functionality. Here, a quasistatic magnetic field can modulate the dispersion relation of plasmons via induced magnetization of (ferro)magnetic component, and/or plasmonic field can, in turn, modify the dielectric tensor of the former. This can be used for biosensing, dual modality bioimaging and enhanced photothermal therapy. We are pursuing coupled modeling and experimental efforts to develop novel biosensing systems and therapeutic nanoplatforms based on core-shell geometries: an iron oxide core with a gold shell and an iron-platinum core with a gold shell.
- Plexcitonics involves plasmon-exciton coupling in hybrid metal/organic/inorganic systems to manipulate absorption and emission of organic/inorganic counterpart as well as the plasmonic field distribution. It can find application in quantum computing and light harvesting. To this point, we are studying doped copper chalcogenide systems coupled to plasmonic metals.
- Spin-Photonics describes optical control of magnetization. Here our efforts are both on inorganic and organic nanostructures with a rich manifold of excited spin states as well as their nanocomposites.
- Switchable/Transformable Materials in which electric, optical, and magnetic fields can be used for dynamic and reversible control of an optical field as well as linear and nonlinear optical functions.
Here our efforts in electrically and optically switchable liquid crystal based photonic structures will be presented.
This talk will conclude with a discussion of new opportunities in metaphotonics.
1. P. N. Prasad “Nanophotonics” John Wiley & Sons, (2004).
2. P. N. Prasad “Introduction to Biophotonics” John Wiley & Sons, (2003).
3. P. N. Prasad “Introduction to Nanomedicine and Nanobioengineering” John Wiley & Sons, (to be published)
Speaker: Dr. Jagdish P. Singh
Institute for Clean Energy Technology
Mississippi State University, Starkville, MS 39759, USA
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Topic: Laser Induced Breakdown Spectroscopy (LIBS) And Its Application To Water And Slurry Samples.
Date/Time: December 30, 2010 (Friday)/ 12 PM
Place: Outreach Auditorium
Abstract : The talk describes the principle of the laser induced breakdown spectroscopy (LIBS) and its application to water and slurry samples. LIBS has been used to detect the elemental composition in different types of samples such as solid, liquid and gas. The characterization of emission from laser induced breakdown with liquid samples using a Nd: YAG laser in single pulse (SP) and double pulse (DP) excitation mode will be presented. It is found that the line emission from magnesium ion/atom is enhanced by more than six times in the case of double pulse excitation in comparison to single pulse excitation mode. The effect of inter-pulse separation on the emission intensity of a magnesium ion and a neutral atom showed an optimum enhancement at a delay of 2.5 -3 ms. This talk also presents a simple theoretical model for the emission from double pulse laser-induced plasma that is developed to better understand the processes and factors involved in enhancement of plasma emission. In this model, the plasma emission is directly proportional to the square of plasma density, its volume, and the fraction of second laser pulse absorbed through inverse Bremsstrahlung absorption by the plasma plume of the first laser pulse.
Speaker: Dr. Rohit Bhargava
Full Time Faculty
Bioimaging Science and Technology
Beckman Institute, University of Illinois, Urbana, IL, USA
(http://www.beckman.uiuc.edu/directory/index.php?qry=BY_NETID&type=BIO&filter=rxb)
Topic: Cancer Pathology Using Infrared Spectroscopic Imaging
Date/Time: February 29, 2008 (Friday)/ 5 PM
Place: L-13
Abstract : Fourier transform infrared (FTIR) spectroscopic imaging is a strongly emerging technique that combines the molecular selectivity of spectroscopy with the spatial specificity of optical microscopy. Hence, the technique is capable of providing molecularly specific imaging without the use of probes or specialized reagents. The data recorded being quantitative, numerical methods can be used to extract information objectively and reproducibly. We first demonstrate a new concept in obtaining high fidelity data using commercial array detectors coupled to a microscope and Michelson interferometer. Next, we apply the developed technique to automate human cancer diagnoses and grading. Traditionally, disease diagnoses are based on optical examinations of stained tissue and involve a skilled recognition of morphological patterns of specific cell types (Histopathology). Utilizing endogenous molecular contrast inherent in vibrational spectra, we employed specially designed tissue microarrays and pattern recognition to develop algorithms for automated classifications. The developed protocol is objective, statistically significant and, being compatible with current tissue processing procedures, holds potential for routine clinical diagnoses. We present the application of the concept to detection and grading of in biopsies for different tissue types. We first demonstrate that the classification of tissue type (histology) and that of disease (pathology) can be accomplished in a manner that is robust and rigorous. Since we employ a classifier based on linear combinations of spectral features, the biochemical basis of tissue recognition is apparent. Since data quality and classifier performance are linked, we quantify the relationship both analytically and empirically through our analysis model. We demonstrate that the classification of tissue is both possible and statistically controllable by using simple parameters to determine operating points. Last, we introduce a systems concept to the idea of automated pathology for prostate, breast and colon tissues. In particular, we demonstrate human competitive capability in recognizing histopathology and in automating disease diagnoses.
Speaker: Pallab Bhattacharya Charles M. Vest Distinguished University Professor of Electrical Engineering and James R. Mellor Professor of Engineering,
Department of Electrical Engineering & Computer Science, University of Michigan, Arbor, MI, USA.
http://www.mnf.umich.edu/ssel/People/index.aspx?id=15
Topic: Quantum Dot Laser: The Ultimate Light Source
Day/ Time: November 06, 2006 at 5PM (Monday)
Place: L-15
Abstract : Self-organized quantum dot lasers, grown by MBE or MOVPE, have demonstrated superior characteristics such as large differential gain, ultra-low threshold current, high output power and large output tenability. However, these devices had successfully eluded researchers in the realization of large modulation bandwidths at room temperature. Typically, a bandwidth f-3dB ~5-8 GHz is measured in single-mode quantum dot lasers. The underlying reasons have been elucidated from detailed femto-second differential transmission spectroscopy measurements. In this talk, the speaker also introduced special techniques, such as modulation doping and tunnel injection, that are required to enhance quantum dot laser performance. Tunnel injection and p-doped quantum dot lasers now exhibit extreme temperature stability (T0 à ¥ ), large modulation response frequency (~25 GHz) together with near-zero chirp and linewidth enhancement factors. These characteristics are better than those of pseudomorphic quantum well lasers. Quantum dot lasers grown directly on silicon substrates, with ~4% lattice mismatch, show room temperature performance with power outputs ~ 50 – 100 mW. These are the first electrically injected lasers grown directly on silicon. Quantum dot lasers have also demonstrated large power outputs (~14W).The properties of these fascinating lasers and the underlying physics were described in this talk.
Speaker
Michael S. Feld, Professor of Physics &
Director, George R. Harrison Spectroscopy
Laboratory, MIT, USA
(http://web.mit.edu/spectroscopy/overview/index.html)
Topic: Seeing Small Biological Structures With Light
Date/Time: January 20, 2006 at 5 PM (Friday)
Place: L-15
Abstract : Conventional light microscopy can only study structures as small as a light wave, a limitation imposed by diffraction. However, by utilizing optical interference, tissues, cells and organelles can be probed at the nanometer length scale, in their native state, without fixation or other pre-processing. Two types of such interference-based techniques, light scattering spectroscopy (LSS) and low coherence interferometry (LCI) were be described. It was discussed how LSS can be used to study large and small sub-cellular structures. In rat epithelium, the small-scale (nm) structure exhibits scale-invariance (i.e. it is fractal). LCI instruments for quantitative phase microscopy and their application to study of red blood cell dynamics and neural activity were also described. The prospect of an optical microscope capable of providing tomographic images of small biological structures were discussed.
The following lectures were held on februrary 28, 2005 at L-15
| Speaker | Affiliation | Topic |
| Dr. D D Bhawalkar | DAE/IITK | Laser Cooling |
| Prof K R Sarma (PPT) | Samtel | Recent advances in Display Technology |
| Prof R R Dasari(PPT) | MIT | Spectroscopy for Diagnosis of Disease |
| Prof G Ravindra(PPT) Kumar | TIFR | New Peaks |
| Dr Rama Chari(PPT) | CAT Indore | Fiber Nonlinearity as a Monitor of Ultra-short Pulse Characteristics |
| Prof B P Singh(PPT) | IITB | Optoelectronic and Nonlinear optical Processes in Low Dimensional Organic and Inorganic Semiconductors |
| Prof Alika Khare(PPS) | IITG | Periodic Structures via Laser Matter Interaction |
Ramachandra Rao Dasari,former Professor of Physics, I.I.T. Kanpur, age 87, passed away in Schererville,IN,U.S.A. on April 12, 2020.He was born in India in Krishna District of Andhra Pradesh. He had all his education in India receiving B.Sc. in 1954 from Andhra University, M.Sc. in 1956 from Benares Hindu University and Ph.D. in 1960 from Aligarh Muslim University. He joined the faculty of the Department of Physics at the Indian Institute of Technology Kanpur in 1962 and became a full professor in 1973. During this period, he spend two years at MIT (1966-68) as a visiting scientist and gained valuable experience in the fabrication of lasers and research in laser physics. Prof. Dasari's major accomplishments at IIT, Kanpur include building one of the largest Laser laboratories for university research in India,(many lasers were actually built at IIT Kanpur) training large number of Ph.D students in laser research and interactions with R&D laboratories such as Central Electronics Ltd, New Delhi, and Bharat Heavy Electricals, Hyderabad for laser technology based instrumentation. As Physics panel member of UGC, he had initiated number of new initiatives for improvements in undergraduate education and organized workshops for training of teachers. Besides laser fabrication he also worked in high resolution spectroscopy of simple molecules, vibrational-rotational relaxations in infrared and laser spectroscopy of rare-earth ions in single crystals. He left IIT Kanpur in 1978.
Canada And USA
Prof. Dasari spend a year (1978-79) as a visiting Senior Research Officer at the National Research Council of Canada, Ottawa and another year (1979-80) as visiting Scientist at the Department of Physics, University of British Columbia, Vancouver. He joined MIT in 1980 as a visiting Professor of Physics. In 1981 he was appointed Principal Research Scientist in Spectroscopy Laboratory. In 1984 he was appointed as Assistant Director of the Spectroscopy Laboratory and later promoted as Associate Director in 1992. He oversaw project coordination and facility developments of the National Institute of Health supported MIT Laser Biomedical Research Centre and also coordinated research programs associated with the National Science Foundation supported Laser Research facility. His major research activities were laser biomedical studies leading to spectral diagnosis of disease using several techniques like scattering, reflectance, fluorescence, and Raman spectroscopy. Specifically, detection of early stages of cancer in several organs of the body including breast, colon, bladder, esophagus, uterine cervix, and oral cavity was the major theme of research. Also he was involved in the extensive studies that were conducted in vitro and in some cases in vivo related to atherosclerosis in coronary, femoral and carotid arteries. His other research were related to low coherence interferometry for detection of nanometer motions in cells and neurons, Dicke narrowing in infrared transitions, laser nuclear studies, molecular collisions and dynamics and single atom laser.
Publications
Dr. Dasari's research publications numbering close to 200 in referred journals which include Physical Rev. Letters, Physical Review, Nature, Optics Letters, Applied Optics, Journal of Quantum Electronics, Applied Spectroscopy, , Journal of Chemical Physics, Journal of Molecular Spectroscopy, Cancer Research, Gastro Enterology, etc. He had given numerous lectures at universities in the U.S.A., Canada, and India and participated in several international conferences. Under his supervision, twelve students have received Ph.D.degrees and several students received M.S./M.Tech degrees.
International Day of Light (20 May 2022)
Pictures From the Day
Talk by Dr. Deepak Jain on Novel Optical Fibers for Light Sources and Optical Communication
| Time | Event |
|---|---|
| 10.00 to 10.15 am | Introduction to the event |
| 10.15 to 11.15 am | Talk 1:How to promote yourself as a young researcher? Seminar by: Dr. Deepak Jain Assistant Professor, IIT Bombay |
| 11.15 to 11.50 am | High tea break+ Optica membership and goodies distribution |
| 12.00 to 1.00 pm | Talk 2: Novel Optical Fibers for Light Sources and Optical Communication |
| 4.30 pm onwards | Student interaction session+ discussion on writing postdoc fellowship proposals |
Mini-symposium on Photonics
March 23, 2018
(Venue for all events is SL 215, CELP seminar room)
Photo Gallery
Inauguration and Guest Lecture
| Date | Speaker | Title |
|---|---|---|
| 3.00 to 3.10 pm | Introduction to the event | |
| 3.10 to 4.10 pm | Dr. Balaji Srinivasan,Dept of EE, IIT Madras |
Light beams with a Twist - Vortex Beam Generation & Amplification in Optical Fibers.
Abstract: ptical beams possessing orbital angular momentum (OAM), also known as twisted light beams or vortex beams have gained much interest in recent years due to the potential use in optical tweezers, high resolution microscopy, material processing, and free-space communications. Specifically, higher order OAM modes are quite attractive for the above applications as they provide multiple orthogonal light paths. Although several promising techniques exist in the literature for exciting such OAM modes, none of them are directly fiber compatible and not all of them can multiplex many OAM modes with low loss. |
| 4.10 to 4.30 pm | Tea break | |
| 4.30 to 5.30 pm | Dr. Pabitra Nath, Dept of Physics, Tezpur University |
Lab-on-phone: A new platform to obtain user-friendly sensing system.
Abstract: According to International Telecommunication Union (ITU), till 2016 almost 7 Billion people around the world are connected by the mobile network facility. These data signifies that irrespective of rural or urban region, a cellular phone is accessible everywhere. Out of these 7 Billion cellphone users approximately 40% of them can be considered as smartphone. A smartphone in general is equipped with different high-end opto-electronic sensors, fast central processing unit, an ever improving RAM-ROM and graphical user interface; which facilitate a user to use it for different applications. Again, for analysis and data processing, a need based mobile application can be developed within the phone itself. Due to vast availability of smartphones and its continuous improvement both in software and hardware part, effort has been made by the researchers around the world to convert it into a useful tool for sensing and imaging of various chemical and biological samples. In this presentation, a brief research activity related to design of smartphone platform sensing system currently undertaken by the speaker at his parent institution -Tezpur University will be discussed. |
| 5.30 to 6.30 pm | Prof. Kallol Bhattacharya, Dept of Applied Optics and Photonics, Calcutta University |
Pancharatnam phase and its applications in Optical Interferometry.
Abstract: In a landmark publication in 1956 Pancharatnam showed that if polarized light is brought back to its initial state of polarization through a series of polarization transformations, the polarization phase associated with the light beam is proportional to the solid angle subtended by the area of the Poincare sphere enclosed by the locus of the polarization path traversed by the light beam. What distinguishes polarization phase from propagation phase is the fact that the former is completely independent of the wavelength of light. The talk attempts to explain the origin of Pancharatnam phase, discuss optical configurations to realize dynamical implementation of Pancharatnam phase and explore its areas of application in phase shifting interferometry, digital holography, quantitative phase microscopy and total internal reflection microscopy. |
For more details view the program poster.
IEEE Women in Photonics Gallery
Poster Session
Prof. Deepa Ventakesh's Talk
Experimental Demonstration
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International Year of Light 2015
The year 2015 has been designated as the International Year of Light by the United Nations, and is being celebrated throughout the world. To quote the Optical Society (OSA):"The International Year of Light and Light-Based Technologies (IYL 2015) is a global initiative that will highlight to the citizens of the world the importance of light and optical technologies in their lives, for their futures, and for the development of society.
As part of the IYL 2015 celebrations, we are planning to hold a one day symposium on 10 October 2015 at the Centre for Lasers and Photonics (CELP) in IIT Kanpur, and would be inviting select alumni to visit us. The event would showcase the contributions of our alumni who are working in the domain of lasers and photonics, and also highlight the recent developments in photonics research at IIT Kanpur. Further, this would also serve as an ideal platform to foster collaborations and exchange of ideas.
QIP course on Optics of Gravitational wave detectors
The five day school on Optics of Gravitational Wave Detectors provided broad introduction to experimental techniques of interferometric gravitational wave detectors such as LIGO.
The course includes tutorials on fundamentals of optics and related areas required for an understanding of GW detectors.
The course is supported by hands-on lab session and demonstration experiments which reinforce the theoretical concepts developed in the course. The course also introduces optics related software Finesse and COMSOL.
Course Coordinator: Pradeep Kumar K, Centre for Lasers and Photonics, IIT Kanpur, Kanpur-208016, India
Dates: 22-27th september,2014
Venue: PBCEC building for lectures. CELP Lab for experiments.
About the School
The five day school on Optics of Gravitational Wave Detectors provides broad introduction to experimental techniques of interferometric gravitational wave detectors such as LIGO. The course includes tutorials on fundamentals of optics and related areas required for an understanding of GW detectors. The course is supported by hands-on lab session and demonstration experiments which reinforce the theoretical concepts developed in the course. The course also introduces optics related software Finesse and COMSOL.
Registration:
Please send an email to This email address is being protected from spambots. You need JavaScript enabled to view it. to register for the course with the following details: Your name, designation, institute, and address. Graduate students who are interested in attending the course must provide a 50-100 word write up about your research. A limited number of undergraduate students will also be accommodated in the course.
Accommodation:Selected candidates will be provided accommodation in Visitor's Hostel on a twin sharing basis. Students will be accommodated in Hostels.
Travel allowance:Selected candidates will be provided traveling allowance (TA) as per QIP norms.
Speakers:Will be announced shortly.
Contact us: Pradeep Kumar K, Centre for Lasers and Photonics, IIT Kanpur, Kanpur-208016, India. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Course contents (Tentative):
| 1. | Overview of gravitational waves and gravitational wave detectors. |
| 2. | Optics of Fabry-Parot cavities: Plane wave analysis, Audio frequency transfer functions, Higher order transverse modes, Geometric stability, Numerical simulations using Finesse. |
| 3. | Laser requirements for GW detectors: Frequency and intensity stabilization issue, High power laser design, Laser diagnostic and developments tools, Thermal-optical effects, Numerical simulations. |
| 4. | Noise in GW detectors: Thermal noise, thermal-elastic noise, Zener damping, Optical thin film coating, noise cancellation, measurement of coating thermal noise, Shot noise, Radiation pressure noise (classical and quantum), noise propagation in interferometers, Numerical simulation using Matlab. |
| 5. | Introduction to network and control systems: Linear system theory, network synthesis, feedback and feed-forward, Pound-Drever-Hall technique as control system, Numerical simulations using Matlab. |
| 6. | Quantum engineering in GW detectors: Squeezed light, generation and characterization of squeezed light, issues in audio-frequency squeezing, quantum non-demolition measurements in interferometers |
Hands-on Experiments:
Experiments such as (a) He-Ne laser characterization (b) Michelson interferometer (c) Study of Fabry-Perot cavity, (d) Beam profile and beam shape measurements of lasers (e) Optical mode cleaner (f) Second harmonic generation
Day#1:
| 9:00-9:20 | Inauguration of school |
| 9:30-11:00 | Lecture 1 |
| 11:00-11:20 | Tea Break |
| 11:30-12:50 | Lecture 2 |
| 1:00-2:30 | Lunch Break |
| 2:30-4:00 | Lecture 3 |
| 4:00-5:30 | Lecture 4 |
| 5:30-5:45 | High Tea |
Day#2:
| 9:00-11:00 | Lecture 5 |
| 11:00-11:20 | Tea Break |
| 11:30-12:50 | Lecture 6 |
| 1:00-2:30 | Lunch Break |
| 2:30-5:00 | Lab Session-I |
| 5:00-5:20 | Tea Break |
| 5:20-6:50 | Lecture 7 |
Day#3:
| 9:30-11:00 | Lecture 8 |
| 11:00-11:20 | Tea Break |
| 11:30-12:50 | Lecture 9 |
| 1:00-2:30 | Lunch Break |
| 2:30-5:00 | Lab Session-II |
| 5:00-5:20 | Tea Break |
| 5:20-6:50 | Lecture 10 |
Day#4:
| 9:30-11:00 | Lecture 11 |
| 11:00-11:20 | Tea Break |
| 11:30-12:50 | Lecture 12 |
| 1:00-2:30 | Lunch Break |
| 2:30-5:00 | Lab Session-III |
| 5:00-5:20 | Tea Break |
| 5:20-6:50 | Lecture 13 |
Day#5:
| 9:30-11:00 | Lecture 14 |
| 11:00-11:20 | Tea Break |
| 11:30-12:50 | Lecture 15 |
| 1:00-2:30 | Lunch Break |
| 2:30-5:00 | Numerical/Software Lab |
| 5:00-5:20 | Tea Break |
| 5:20-5:45 | Closing Remarks |
| 1. | LIGO: On the Threshold of Gravitational-wave Astronomy By Dr. Stanley E. Whitcomb | Click to Open |
| 2. | Lecture on Interferometer Configurations for Gravitational Wave Detectors by Dr. Stanley E. Whitcomb | Click to Open |
| 3. | Lecture on Noises in Gravitational Wave detectors by Dr. Stanley E. Whitcomb | Click to Open |
| 4. | Lecture on Control System in Gravitational Wave Detectors by Dr. Stanley E. Whitcomb | Click to Open |
| 5. | Lecture on Quantum Noise in Gravitational Wave Detectors by Dr. Stanley E. Whitcomb | Click to Open |
| 6. | Lecture on Gravitational Waves by Dr. Unnikrishnan. C. S. | Click to Open |
| 7. | Review of Optics esential for Gravitational Wave Detection by Dr. Pradeep Kumar K | Click to Open |
| 8. | Lecture Note-1(Review of Some Points) by Dr. Unnikrishnan. C. S. | Click to Open |
| 9. | Lecture Note-2(The Interferometer Detector) by Dr. Unnikrishnan. C. S. | Click to Open |
ULTRAFAST PHOTONIC PROCESSES AND INTERACTIONS Workshop
The workshop brought together researchers from the Indian Institute of Technology Madras, Chennai, India (IITM), Indian Institute of Technology Kanpur, Chennai, India (IITK), Dublin City University, Dublin, Ireland (DCU) and Optics Research Centre, University of Southampton, UK (ORC).
The event preceded with the latest developments in high speed and ultrafast photonic interactions and processes in systems from atomic ensembles to devices.
Event provided a valuable opportunity to exchange ideas in a relaxed environment, to create synergies and to establish and schedule new secondments between DCU, ORC, IITK and IITM.
Topics of Interest in Workshop
Optical Signal Processing and Generation
Wavelength conversion, clock recovery function, ultrafast processing of advanced modulation format signals, THz signal generation from non-linear materials and cognate areas of research and innovation.
Optical Materials
Silicon optical waveguides and silicon nanocrystal embedded optical waveguides, inorganic-organic hybrid interfaces and metal-dielectric photonic architectures, nonlinearity in polymers/suitable matrix, nanocomposites incorporating semiconductor quantum dots and cognate areas of research and innovation.
Ultrashort Pulse Detection, applications and simulation
Coherent XUV and soft X-ray generation using femtosecond lasers, XUV and IR autocorrelation techniques, THz streaking, ionization and fragmentation pathways for small quantum systems and plasmas, theoretical studies of small quantum systems in weak and strong radiation fields and cognate areas of research and innovation.
Biophotonics
he application of light to sensing and imaging in, and manipulation of, biological materials, particularly applied to biological and medical problems. It encompasses associated materials development, e.g. probes and platforms and the range of associated optical methods and spectroscopies.
List Of Participants
- Dr. Asima Pradhan
- Dr. R.K. Thareja
- Dr.Pradeep Kumar K.
- Miss. Ankita Jain
- Miss. Seema Devi
- Miss. Neha Goswami
- Mr. Udit Narayan
- Mr. Shyam Lal Gupta
- Mr. Ravi Pratap Singh
- Mr. Nishanth Chandra
- Mr. Mohammad Zaffar
- Mr. Bharat Lal Meena
- Mr. Gyana Ranjan Sahoo
- Mr. Syed Tajammul Ahmed
Photos
- Machine Shop
CELP Workshop Job Requisition form
PDF | DOC - Library
List of books
News & Announcement
- Candidates Shortlisted for Interview in PhD Programme New
- Candidates Shortlisted for Interview in M.S (By Research) Programme New
- PG Admissions 2024-25 1st Semester interview date New
- Candidate selected for Ph.D programme 2023-2024
- Candidate selected for M.Tech programme 2023-2024
- Candidate selected for M.S(By Research) programme 2023-2024
- Nitish Kumar Gupta selected for Outstanding PhD Thesis Award (2023) from PSE
- List of candidates are selected for admission to the Ph.D
- List of candidates are selected for admission to the M.S ( By Research)
- List of candidates shortlisted for interview in M.S. By Research (MSR) programme
- List of candidates shortlisted for interview in PhD programme
- PG Admissions 2022-23 2nd Semester
- Central Manufacturing Technology Institute(CMTI), Bangalore and IIT Kanpur signed a MoU on the 4th July 2022 to undertake collaborative research in Laser Technology, Photonics and Advanced Manufacturing Technology.
- The center welcomes the participation of post-doctoral fellows in research activities.
- Prof Shilpi Gupta has been awarded with P.K Kelkar Fellowship from the Institute.
- Prof Pratik Sen has been awarded with Poonam and Prabhu Goel Chair Professorship.
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