Feb 02, 2021 3:45 pm - Virtual - Colloquium
Xuefeng Jiang - CUNY
Whispering Gallery Mode Microresonator: from Quantum Chaos to Non-Hermitian Physics

Confinement and manipulation of photons using whispering-gallery-mode (WGM) microresonators have triggered intense research interests in both fundamental and applied physics for more than two decades. Due to the superior capability to trap light field in a highly confined volume with ultralow loss, light-matter interactions are significantly enhanced in WGM microresonators, which have shown great promise for a variety of fields of science, spanning from bio/chemical sensors, low-threshold microlasers, and nonlinear optics, to optomechanics, quantum chaos, and quantum information processing. In this colloquium, I will introduce a new type of deformed microtoroidal resonator supporting both ultrahigh quality factor and chaotic dynamics. Using this novel device, we have achieved plenty of photonic applications in the past several years, including unidirectional microlaser, chaos-assisted momentum transformation, Raman laser, frequency combs, and a new sensing mechanism - mode broadening. In the second section of the colloquium, I will briefly discuss an indirect coupled-resonator non-Hermitian system and the uniqueness of this system around an exceptional point. Particularly, we have achieved exceptional points induced transparency and absorption as well as the polarization induced transparency in this non-Hermitian system.