Novel optical phenomena in time-varying media

Abstract

Time-varying optical materials have attracted recent interest for their potential to enable frequency
conversion, nonreciprocal and non-Hermitian physics, photonic time crystals, and more. However, the
description of time-varying optical materials has been largely limited to regimes where material
resonances (i.e., dispersion), can be neglected. In this talk, I will describe a general unifying framework
for describing the optical properties of dispersive time-varying materials. I will show how this framework
can be applied across a wide variety of platforms, including: few level systems that can be realized in
atoms, spins, or qubits; strongly driven polar insulators; and even strongly driven gasses used for high
harmonic generation. I will discuss several new physical phenomena that can be enabled by these
systems. A special emphasis will be placed on using time-varying systems to create novel light sources,

.such as new types of lasers and entangled photon pair sources.

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https://technion.zoom.us/j/98070506957