Dr. Sibnath is a computational photonics researcher with extensive expertise in photonic device modelling, simulation, and optical engineering. He brings a distinguished academic and research background spanning multiple prestigious institutions in India. He earned his B.Tech. in Radio Physics and Electronics and his M.Tech. in Photonics and Nano-Electronics from the Institute of Radio Physics and Electronics, University of Calcutta (2012–2017). During his undergraduate and postgraduate studies, he qualified in national-level competitive examinations, including JEST and GATE.

In August 2018, he joined the Department of Physics at the Indian Institute of Technology (IIT) Jodhpur as a full-time PhD research scholar under the supervision of Prof. Somnath Ghosh. He successfully completed his doctoral degree in February 2024, conducting pioneering research on non-Hermitian singularities and their device applications in guided-wave optical structures. His dissertation made a significant contribution to understanding exceptional points in photonic platforms and their practical technological applications. Following his doctoral completion, he joined the Photonics Division at the Tata Institute of Fundamental Research (TIFR) as an Institute Postdoctoral Fellow on February 23, 2024 (Under the supervision of Prof. Harish NS Krishnamoorthy), under the Department of Atomic Energy (DAE), Government of India. During his postdoctoral tenure, he investigated passive PT-symmetric phase-change metasurfaces and contributed to advancing the field of tunable photonic devices.

He has made substantial contributions to non-Hermitian computational photonics, authoring 14 peer-reviewed journal articles in prestigious international journals, including Physical Review A, Physical Review B, ACS Photonics, Optics Letters, and Journal of the Optical Society of America B. He has presented his research at major international conferences, including FIO+LS, CLEO-Europe, OECC, and other leading photonics forums, with 17 presentations spanning these venues. He has been recognised with multiple international travel grants, enabling him to disseminate his findings to the global photonics community and establish collaborative research networks.

Publications in SCI Journals and International Conferences

Selected publications

[1] S. Dey, A. Laha, and S. Ghosh "Nonlinearity Induced Anomalous Mode Collapsing and Non-chiral Asymmetric Mode Switching around multiple Exceptional Points." Physical Review B, 101, 125432 (2020).

[2] S. Dey, A. Laha, and S. Ghosh. "Exotic light dynamics around an exceptional point of order four associated with three connecting second-order exceptional points" Journal of the Optical Society of America B, 38, 1297—1306 (2021).

[3] S. Dey, A. Roy, and S. Ghosh "Light dynamics around an exceptional point in a 1D photonic bandgap waveguide." Physica Scripta, 97, 085501 (2022).

[4] A. Laha, S. Dey, H. K. Gandhi, A. Biswas, and S. Ghosh "Exceptional Point and Toward Mode Selective Optical Isolation." ACS Photonics, 7, 967--974 (2020).

[5] S. Dey and S. Ghosh. "Exploring anomalous light dynamics around higher-order conjugate exceptional points with local nonlinearity." Physical Review A, 108, 023508 (2023).

[6] A. Roy, S. Dey, A. Laha, A. Biswas, and S. Ghosh. "Exceptional-point-induced asymmetric mode conversion in a dual-core optical fiber segment " Optics Letters, 47, 2546—2549 (2022).

[7] A. Roy, S. Dey, A. Biswas, and S. Ghosh "Hosting Exceptional Point in All-lossy Dual-Core Optical Fiber and Its Exotic Chiral Light Dynamics." Physica Scripta., 99, 055505 (2024).

[8] S. Dey, A. Laha, and S. Ghosh, "Modal dynamics around a fourth-order exceptional point in a planar optical waveguide," in Frontiers in Optics / Laser Science, B. Lee, C. Mazzali, K. Corwin, and R. Jason Jones, eds., OSA Technical Digest (Optica Publishing Group, 2020), paper JTu1B.5.

[9] S. Dey and S. Ghosh, "Hosting exceptional points in 1D photonic bandgap waveguide for mode engineering," 2021 Opto-Electronics and Communications Conference (OECC), Hong Kong, Hong Kong, 2021, pp. 1-3, doi: 10.1364/OECC.2021.W4C.5.

[10] S. Dey and S. Ghosh, "Robust Reverse Chiral Light Dynamics Around Conjugate Exceptional Points in 1D Photonic Bandgap Waveguides," 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), Munich, Germany, 2023, pp. 1-1, doi: 10.1109/CLEO/Europe-EQEC57999.2023.10232146.