Author(s): Yang, YD (Yang, Yue-De); Hao, YZ (Hao, You-Zeng); Ma, CG (Ma, Chun-Guang); Shen, ZZ (Shen, Zheng-Zheng); Xiao, JL (Xiao, Jin-Long); Huang, YZ (Huang, Yong-Zhen)

Source: OPTICS EXPRESS Volume: 28 Issue: 24 Pages: 36784-36795 DOI: 10.1364/OE.411298 Published: NOV 23 2020

Abstract: We theoretically and numerically study optical modes in regular-polygonal microcavities with non-uniform gain and loss, where high quality (Q) whispering-gallery-like modes typically appear as superstar states. High Q superstar modes can be described by the propagating plane waves in an effective rectangle formed by unfolding the periodic orbits and exhibit regular and predictable spatial field distributions and transverse-mode spectra. With non-unitbrm gain and loss, anti-Hermitian coupling between the transverse modes with close frequencies occurs according to the mode coupling theory, which results in novel mode properties such as modified mode spectra and field patterns, and the appearance of exceptional points. Numerical simulation results are in good agreement with the theoretical analyses, and such analyses are also suitable for other kinds of high Q microcavities with non-uniform gain and loss. These results will be highly useful for studying non-Hermitian physics in optical microcavities and advancing the practical applications of microcavity devices. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Accession Number: WOS:000592953200108

ISSN: 1094-4087

Full Text: https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-24-36784&id=442762