Upcoming Talks

Prof. Rajarshi Roy, University of Maryland

Complex Photonics Dynamics: counting single photons, birthing chaotic attractors, and generating random numbers

November 28, 2022 – 8:30 PM IST

Abstract: Light conveys energy and information and is a primary means of communication today. Dr. Rajarshi Roy will describe concepts and experiments that have revealed new aspects of light and its interaction with matter, including synchronization of light sources and the communication of information. Detecting single photons can reveal how a system with complex photonic dynamics can transition from a Poisson process to a chaotic attractor. The application of time-delayed feedback to produce chaotic dynamics at extreme speeds and generate random numbers will illustrate an unexpected benefit of chaotic dynamics. Quantum fluctuations are random seeds amplified to macroscopic levels in a deterministic system.

Rajarshi Roy studied Physics at St. Stephen’s College in Delhi, India, and received a Ph.D. in Physics from the University of Rochester in 1981. He has advised about forty doctoral students at Georgia Tech (1982 – 1999) and the University of Maryland (1999 – present). He has served as chair of the School of Physics at Georgia Tech (1996 – 1999) and Director of the Institute for Physical Science and Technology (2003 – 2014) at the University of Maryland. He is a professor in the Department of Physics and the Institute for Physical Science and Technology. He was a visitor at Bell Labs in Murray Hill in the spring of 1987, a visitor at NIH in 2009 and 2014, and Benedict Distinguished Visiting Professor at Carleton College in 2020 for the fall semester. He is a fellow of the Optical Society of America (now Optica) and the American Physical Society.