Abstract

We show that inhomogeneous waveguides of slowly varied parity-time (PT) symmetry support localized optical resonances. The resonance is closely related to the formation of exceptional points separating exact and broken PT phases. Salient features of this kind of non-Hermitian resonance, including the formation of half-vortex flux and the discrete nature, are discussed. This investigation highlights the unprecedented uniqueness of field dynamics in non-Hermitian systems with many potential adaptive applications.

© 2021 Chinese Laser Press

Fluctuations and noise-limited sensing near the exceptional point of parity-time-symmetric resonator systems

N. Asger Mortensen, P. A. D. Gonçalves, Mercedeh Khajavikhan, Demetrios N. Christodoulides, Christos Tserkezis, and Christian Wolff
Optica 5(10) 1342-1346 (2018)

Quantum interference in anti-parity-time symmetric coupled waveguide system

Yan Qin, Haixia Chen, Dajin Luo, Churong Pan, Huajie Hu, Yingxin Zhang, and Dong Wei
Opt. Express 29(18) 29175-29185 (2021)

Detecting topological exceptional points in a parity-time symmetric system with cold atoms

Jian Xu, Yan-Xiong Du, Wei Huang, and Dan-Wei Zhang
Opt. Express 25(14) 15786-15795 (2017)

Gap solitons and symmetry breaking in parity-time symmetric microring coupled resonator optical waveguides

Pedro Chamorro-Posada
J. Opt. Soc. Am. B 31(11) 2728-2735 (2014)

Non-reciprocal parity-time symmetry breaking based on magneto-optical and gain/loss double ring resonators

Yuma Kawaguchi, Andrea Alù, and Alexander B. Khanikaev
Opt. Mater. Express 12(4) 1453-1460 (2022)