Research Interest

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PhD Work at a Glance :

During my time as a research scholar at Prof. Prem Bisht's Laboratory, IIT Madras, I had access to a well-established laboratory that helped me develop my interest in nonlinear light matter interactions under ultrafast laser excitation. This led me to study the self-phase modulation and spectral broadening of ultrafast laser pulses, as well as higher order nonlinear effects such as stimulated Raman scattering and four wave mixing. To further explore these phenomena, I built a supercontinuum generation setup using photonic crystal fiber and pumping it with nanojoule femtosecond laser pulses. I also investigated the thermal effects that occur when measuring nonlinear parameters of optical materials, using a combination of numerical and experimental methods. My work with Prof. S.P. Singh from the University of Arkansas, USA, motivated me to investigate pump-probe type geometries under continuous wave laser conditions, which resulted in the generation of a ring-shaped beam similar to Laguerre Gaussian vortex beams. By comparing the phase profile of the thermally induced beam with that of the LGV beam through interferometric study, I found a distinctly different phase structure. Additionally, I had the opportunity to contribute to the building of a Non-colinear Optical Parametric Amplifier and a Transient Absorption setup during my PhD tenure. My experience in these areas motivates me to explore further research into structured beam generation and its application in quantum optics and optical trapping experiments.

Current Research Interest :

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• Experiment on Fundamental Physics
• Ultracold Atom and Atom Interferometry
• Instrumentation and Optical Metrology
• Quantum Optics and Single Photon Detector
• Entangle photon generation from sponteneous parametric down conversion (SPDC)
• Structured Beam (Laguerre Gaussian Vortex type) generation and application
• Femtosecond pulse broadening and autocorrelation
• Ultrafast dynamics and transient absorption spectroscopy

Research Activity

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JOURNAL PUBLICATIONS

1. "Ring shaped fs supercontinuum with a thermally induced self-diffraction effect", Soumyodeep Dey, Sugandh Sirohi, Surendra Singh, and Prem Bisht, Applied Optics Vol. 61, No. 32 (2022); doi.org/10.1364/AO.473714


2. "Investigation of thermal nonlinearity due to nJ high repetition rate fs pulses on wrinkled graphene", Soumyodeep Dey, Sudhakara Reddy Bongu, Vijay Kumar Sagar and Prem Ballabh Bisht, Journal of the Optical Society of America B Vol. 38, No. 6 (2021); doi.org/10.1364/JOSAB.420119


3. "Study of a dark core beam generated by nonlinear thermo-optical effect", Soumyodeep Dey, Sailaja Rallabandi, Surendra Singh and Prem Ballabh Bisht, Optics & Laser Technology 134, 106652 (2021); doi.org/10.1016/j.optlastec.2020.106652


4. "Broad band nonlinear optical absorption measurements of the laser dye IR26 using white light continuum Z-scan", Soumyodeep Dey, Sudhakara Reddy Bongu, and Prem Ballabh Bisht, Journal of Applied Physics 121, 113107 (2017); doi.org /10.1063/1.4978762


5. "Laguerre–Gaussian vortex beam for reduced thermal effects in nonlinear optical studies", Sugandh Sirohi, Soumyodeep Dey, Tulika Agrawal, Surendra Singh and Prem Ballabh Bisht, Optics Communications Volume 537, 129468 (2023); doi.org/10.1016/j.optcom.2023.129468


6. "Single nanoparticle sensing and waveguide applications using photonic nanojet from an array of shaped microparticles", Tulika Agrawal, Soumyodeep Dey and Prem Ballabh Bisht, Optics Communications, 129110 (2022); doi.org/10.1016/j.optcom.2022.129110


7. "Numerical investigations on photonic nanojet coupled plasmonic system for photonic applications", Tulika Agrawal, Soumyodeep Dey, Shubhayan Bhattacharya, Gurvinder Singh and Prem Ballabh Bisht, Journal of Optics 24, No. 4, 044008 (2022); doi.org/10.1088/2040-8986/ac4d73


8. "Probing heteroatoms co-doped graphene quantum dots for energy transfer and 2-photon assisted applications", Vijay Kumar Sagar, Soumyodeep Dey, Shubhayan Bhattacharya, Pooria Lesani, Yogambha Ramaswamy, Gurvinder Singh, Hala Zreiqat and Prem Ballabh Bisht, Journal of Photochemistry and Photobiology A: Chemistry, Volume 423 (113618), (2022); doi.org/10.1016/j.jphotochem.2021.113618


9. "Optical characterization of graphene-f-o-phenylenediamine and charge transfer interaction with organic dye", Vijay Kumar Sagar, Shubhayan Bhattacharya, Soumyodeep Dey and Prem Ballabh Bisht, Carbon 166, 15-25 (2020); doi.org /10.1016/j.carbon.2020.05.026

CONFERENCE PROCEEDINGS

1. “Generation of supercontinuum with nJ pulses in 450-1700nm range”, Soumyodeep Dey, Sudhakara Reddy Bongu, and Prem Ballabh Bisht, 13th International Conference on Fiber Optics and Photonics, (2016); doi.org /10.1364/PHOTONICS.2016.Th3A.30


2. "Thermal and optical nonlinearity due to broadened femtosecond nJ pulses at high repetition rate", Soumyodeep Dey, Sudhakara Reddy Bongu, and Prem Ballabh Bisht, AIP Conference Proceedings 2244, 060006 (2020); doi.org /10.1063/5.0009060

POSTER PRESENTATIONS

1. “Zero dispersion wavelength shift in solid core photonic crystal fibre” in National Laser Symposium (NLS-26), BARC, Mumbai, S. Dey, S. R. Bongu and P. B. Bisht, Dec-19-24, (2017)


2. “Transient Absorption Spectroscopy with White Light Continuum Generated with nJ Femtosecond Pulses” in National Laser Symposium (NLS-26), BARC, Mumbai, S. Dey, S. R. Bongu and P. B. Bisht, Dec-19-24, (2017)


3. “Supercontinuum generation in photonic crystal fibre on pumping with fs laser pulses”, S. Dey, S. R. Bongu, P. B. Bisht in International Conference on Advancement in Science and Technology (ICAST-2018),Visva-Bharati, Santiniketan, India, September 3-4, (2018)


4. “Effects of Pump Pulse-duration on Supercontinuum Generation in Photonic Crystal Fibre”, S. Dey , S. R. Bongu, P. B. Bisht, (70) Photonics 2018, Dec 12-15, IIT Delhi, New Delhi, India (2018)

WORKSHOP PARTICIPATED

1. Participated in the Science and Technology Exhibition 2011 organized by the IEEE Calcutta University Student Branch.


2. Participated in a UGC sponsored National Seminar on Quantum Mechanics: Inception, Evolution and Future organized by Department of Physics, Narasinha Dutta College, Howrah in collaboration with Seth Anandram Jaipuria College, Kolkata in a three-day workshop.


3. Participated in West Bengal Science & Technology Congress in a two day workshop organized by Ramakrishna Mission Residential College (Autonomous), Narendrapur in collaboration with West Bengal Science & Technology Department, Government of West Bengal.