Non-Hermitian and topological photonics: optics at an exceptional point

Author:

Parto Midya1,Liu Yuzhou G. N.2,Bahari Babak2,Khajavikhan Mercedeh21,Christodoulides Demetrios N.1

Affiliation:

1. CREOL, College of Optics and Photonics, University of Central Florida, 4304 Scorpius St, Orlando, Florida, USA

2. Viterbi School of Engineering, University of Southern California, 3737 Watt Way, Los Angeles, Los Angeles, California, USA

Abstract

AbstractIn the past few years, concepts from non-Hermitian (NH) physics, originally developed within the context of quantum field theories, have been successfully deployed over a wide range of physical settings where wave dynamics are known to play a key role. In optics, a special class of NH Hamiltonians – which respects parity-time symmetry – has been intensely pursued along several fronts. What makes this family of systems so intriguing is the prospect of phase transitions and NH singularities that can in turn lead to a plethora of counterintuitive phenomena. Quite recently, these ideas have permeated several other fields of science and technology in a quest to achieve new behaviors and functionalities in nonconservative environments that would have otherwise been impossible in standard Hermitian arrangements. Here, we provide an overview of recent advancements in these emerging fields, with emphasis on photonic NH platforms, exceptional point dynamics, and the very promising interplay between non-Hermiticity and topological physics.

Funder

Defense Advanced Research Projects Agency

Air Force Office of Scientific Research

United States-Israel Binational Science Foundation

Army Research Office

Office of Naval Research

National Science Foundation

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

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