Low-Threshold Lasing and Coherent Perfect Absorption in Generalized \nPT\n-Symmetric Optical Structures

Maryam Sakhdari, Nasim Mohammadi Estakhri, Hakan Bagci, Pai-Yen Chen

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Achieving exact balance between spatially separated gain and loss is generally regarded as a necessary condition for parity-time- (PT-)symmetric optical systems. We introduce generalized PT- (GPT-)symmetric optical structures, which have an asymmetric and unbalanced gain-loss profile, while exhibiting similar scattering properties and phase transitions as their traditional PT-symmetric counterparts. In particular, we show that the concept of GPT symmetry may help to reduce the threshold gain in achieving newly discovered PT-enabled applications, such as the coherent perfect absorber laser and exceptional points. The concept proposed herein will facilitate the practice of PT-symmetric optical and photonic devices by offering greater design flexibility to tailor gain-loss profiles and their thresholds.
Original languageEnglish (US)
JournalPhysical Review Applied
Volume10
Issue number2
DOIs
StatePublished - Aug 21 2018

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