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Academic Details
Academic Details
Prime Minister Research Fellow at Department of Physics, IIT Kharagpur (2020-Present)
Master of Science in Physics, IIT Kharagpur (2018-2020)
Bachelor of Science (Honours) in Physics, Calcutta University (2015-2018)
Achievements
Achievements
2021 Prime Minister's Research Fellowship (PMRF)
2020 AIR-226 in JEST
2019 AIR-184 in JRF(CSIR)
2018 AIR-260 in JAM
2018 AIR-42 in JEST
2018 National Top 1% NGPE, IAPT
PhD Coursework
PhD Coursework
Physics of Photonic Devices
Physics and Technology of Optical Fibers
Non-linear Optics
Laser Spectroscopy
Light Induced Phenomena in Materials
English for Technical Writing
Current Research
Current Research
Currently, I am working on optical vortices which have distinct amplitude and phase behavior near the vortex pivot point and can carry angular momentum. This work is carried out for (6+1) identical cores operating in single-mode with two opposite polarizations. The equations for our system of multicore fibers operating in single-mode supporting two polarizations were modeled using discrete nonlinear Schrodinger equation and Manakov equations. Solution in the form of stable discrete vortices characterized by the topological charge was chosen to find a system of equations analytically. This can be used to find values of field amplitudes and propagation constant in terms of the topological charge. Small perturbation was introduced in the background of the vortex solutions and linear stability analysis was carried out analytically. The resulting system of homogenous equations can be used to find gain spectrum for every solution with different amplitudes and topological charge. Examining the stability of optical vortices and their robustness to withstand instability and distortion may lead to efficient optical power and data transfer. The existence of stable optical vortices in multicore fiber structures may have many potential applications such as coherent light source, optical switches, phase and amplitude modulation. The properties of optical vortices of carrying high power and conserving orbital angular momentum may be exploited to have applications in communication systems and high capacity transmissions.
Currently, I am working on optical vortices which have distinct amplitude and phase behavior near the vortex pivot point and can carry angular momentum. This work is carried out for (6+1) identical cores operating in single-mode with two opposite polarizations. The equations for our system of multicore fibers operating in single-mode supporting two polarizations were modeled using discrete nonlinear Schrodinger equation and Manakov equations. Solution in the form of stable discrete vortices characterized by the topological charge was chosen to find a system of equations analytically. This can be used to find values of field amplitudes and propagation constant in terms of the topological charge. Small perturbation was introduced in the background of the vortex solutions and linear stability analysis was carried out analytically. The resulting system of homogenous equations can be used to find gain spectrum for every solution with different amplitudes and topological charge. Examining the stability of optical vortices and their robustness to withstand instability and distortion may lead to efficient optical power and data transfer. The existence of stable optical vortices in multicore fiber structures may have many potential applications such as coherent light source, optical switches, phase and amplitude modulation. The properties of optical vortices of carrying high power and conserving orbital angular momentum may be exploited to have applications in communication systems and high capacity transmissions.
Teaching Assistant
Teaching Assistant
Condensed Matter Physics- I at IIT, Kharagpur (Jan-Apr 2022)
Physics of Wave Theory Tutorial at IIT, Kharagpur (Apr-Jun 2022)
Electrodynamics Tutorial at Hijli College, Kharagpur (May-Aug 2022)
Electromagnetism-I Tutorial at IIT, Kharagpur (Jul-Nov 2022)
Nuclear and Particle Physics Lecture at Hijli College, Kharagpur (Aug-Nov 2022)
Physics Laboratory at IIT, Kharagpur (Oct-Feb 2023)
Nanotechnology and Applications Lecture at Hijli College, Kharagpur (Feb-Apr 2023)
Mathematical Physics Tutorial at Hijli College, Kharagpur (Mar-Apr 2023)
Classical Mechanics Tutorial at Hijli College, Kharagpur (Mar-Apr 2023)
Physics of Wave Theory Tutorial at IIT, Kharagpur (Jan - Apr 2023)
Physics Laboratory at IIT, Kharagpur (Jul - Nov 2023)
Atomic and Molecular Physics Tutorial at IIT, Kharagpur (Jan - Apr 2024)
Optics Tutorial at IIT, Kharagpur (Jan - Apr 2024)
Electromagnetism at IIT, Kharagpur (Jul - Nov 2024)
Publications
Publications
S. Khushhali, A. Paul and S. Roy, “Vortex soliton clusters in twisted circular waveguides,” 2026. Manuscript under preparation.
S. Khushhali, A. Paul and S. Roy, “Family of symmetric and asymmetric localized vortex modes in Holmium-doped nonlinear hexagonal multicore fiber,” JOSA B, accepted, 2026. DOI: 10.1364/JOSAB.604077
S. Khushhali, R. Adhikary, C. Ferrante, C. Antonelli, A. Mecozzi, A. Marini and S. Roy, “Localization of optical vortices in nonlinear hexagonal multicore fibres,” Physical Review A 110, 013507, 2024. DOI: 10.1103/PhysRevA.110.013507
S. Khushhali, A. Marini and S. Roy, “Homogeneous-Like Nonlinear Discrete Optical Vortices in a Nonlinear Multicore Fiber with Unequal Coupling for Two Polarizations,” Optica Technical Digest Series, 2024. DOI: 10.1364/FIO.2024.JTu4A.68
S. Khushhali, A. Marini and S. Roy, “Homogenous Vortex Solutions in a Nonlinear Multicore Fiber,” Optica Technical Digest Series, 2023. DOI: 10.1364/FIO.2023.JM7A.123
S. Khushhali, A. Marini and S. Roy, “Vortex solitons in nonlinear multicore fiber with six periphery cores and one central core,” Optica Technical Digest Series, 2023. DOI: 10.1364/NLO.2023.M4A.22
S. Khushhali, A. Paul and S. Roy, “Homogeneous Vortex Solutions in Nonlinear Multicore Fiber with and Without Polarization Cross-Coupling,” in Advances in Fibers, Optical Sensors, Optical Communications and Network, 2023. DOI: 10.1007/978-981-97-4884-6_18
Conferences
Conferences
Presented at the Platinum Jubilee Conference on Contemporary Physics, 29–31 Mar, 2026, IIT Kharagpur, India
Presented at the 16th International Conference on Fiber Optics and Photonics, 12–15 Dec, 2024, IIT Kharagpur, India
Presented at Frontiers in Optics + Laser Science, 23–26 Sep, 2024, Denver, Colorado, USA
Presented at Frontiers in Optics + Laser Science 9–12 Oct, 2023, Tacoma, Washington, USA
Presented at the International Conference on Photonics, 5–8 Jul, 2023, IISc Bangalore, India
Presented at the Nonlinear Optics Topical Meeting, 10–13 Jul, 2023, Honolulu, Hawaii, USA
Attended National Laser Symposium–31, 3–6 Dec, 2022, IIT Kharagpur, India
Masters Thesis Project - Review of "Higgs mass spectrum in R-parity conserving MSSM and Neutrino masses in R-parity violating MSSM "
Dissertation
Dissertation
Masters Thesis Project - Review of "Higgs mass spectrum in R-parity conserving MSSM and Neutrino masses in R-parity violating MSSM "
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