| Invited Talk

Name of the Speaker: Alekhya Ghosh
Venue: ESB-244 (Seminar Hall)
Date/Time: 19th November 2025 (Wednesday), 4:00 PM
Title: Exploring nonlinear light dynamics in integrated micro resonators

Abstract :

Optical microresonators provide a versatile platform for exploring nonlinear dynamics and generating optical frequency combs on a chip. These systems exhibit a range of phenomena arising from the interplay between dispersion and nonlinearity. In my talk, I will discuss recent advances in understanding spontaneous symmetry breaking of light in single resonator systems and coupled microresonator arrays, as well as frequency comb formation under different dispersion regimes. I will also describe the experimental realization of these phenomena, including the fabrication of high-quality silicon nitride and aluminum nitride resonators. Together, these studies shed light on the fundamental physics of nonlinear ring resonators and point toward new opportunities in integrated photonic technologies.

Speaker Bio:

Alekhya Ghosh is a fourth-year Ph.D. student in Dr. Pascal Del’Haye’s group at the Max Planck Institute for the Science of Light (MPL), Erlangen, Germany. He has experience in both theoretical modeling and experimental realization of nonlinear optical phenomena in microresonators, including cleanroom fabrication of integrated silicon nitride and aluminum nitride devices. Alekhya earned his Master’s degree in Advanced Optical Technologies from Friedrich Alexander University Erlangen-Nürnberg. His master’s thesis explored multimode cooling in optomechanical systems. He completed his Bachelor of Technology in Electronics and Communication Engineering at the University of Calcutta.