Phase regimes of parity-time-symmetric coupled-ring systems at exceptional points

作     者：ZHUANG MA XIAOYAN ZHOU LIN ZHANG ZHUANG MA;XIAOYAN ZHOU;LIN ZHANG

作者机构：Tianjin Key Laboratory of Integrated Opto-electronics Technologies and DevicesSchool of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Peng Cheng LaboratoryShenzhen 518038China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2022年第10卷第10期

页      面：2374-2379页

核心收录：

学科分类：07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 0702[理学-物理学] 

基　　金：Tianjin University  TJU 

主　　题：resonator waveguide coupled 

摘      要：The optical coupled resonant system consisting of an integrated resonator with gain and a resonator with loss provides an excellent platform to create exceptional points(EPs)in non-Hermitian *** previous studies have focused on the striking intensity feature of EPs,but its phase response is seldom *** this work,we present a thorough study on the phase response of an EP ***,the phase response exhibits distinct behavior depending on the ordering of the ring resonators:when the input light in a bus waveguide is coupled directly or indirectly to the ring with a gain,the phase response is featured by nonmonotonic transition and 2π monotonic transition,*** also prove that the newly identified phase features are theoretically *** phase responses produce unique group delays that have never been found in other coupled resonant *** results deepen our understanding on EPs in non-Hermitian systems and are potentially useful for practical applications exploiting phase features.