Dynamic phase transition region in electrically injected PT-symmetric lasers  

作　　者：YANG CHEN YUFEI WANG JINGXUAN CHEN TING FU GUANGLIANG SUN ZIYUAN LIAO HAIYANG JI YINGQIU DAI WANHUA ZHENG 

机构地区：[1]Laboratory of Solid State Optoelectronics Information Technology,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]College of Future Technology,University of Chinese Academy of Sciences,Beijing 101408,China [4]Weifang Academy of Advanced Opto-electronic Circuits,Weifang 261021,China [5]State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China

出　　处：《Photonics Research》2024年第11期2539-2548,共10页光子学研究(英文版)

基　　金：National Natural Science Foundation of China(62075213);National Key Research and Development Program of China(2021YFA1400604)。

摘　　要：Research on parity-time(PT)symmetry and exceptional points in non-Hermitian laser systems has been extensively conducted.However,in practical electrically injected PT-symmetric lasers,the frequency detuning and linewidth enhancement factor of the laser can influence the symmetry breaking of the system in another dimension.We find that the previous exceptional point now transforms into a dynamic phase transition region,where the states are temporally unstable,indicating the occurrence of multimode oscillation.The relative phase and field amplitude ratio in this region also exhibit many novel phenomena indicating its instability.This region can be manipulated by adjusting the coupling strength between adjacent waveguides and the pumping intensity in the loss waveguide.Experimentally,we characterize the near-field,far-field,and spectrum of several structures,and the results validate our theoretical model.This work elucidates the dynamic process and phase transition process of electrically injected PT-symmetric lasers,providing support for the practical application of PT-symmetric lasers.

关 键 词：tuning PUMPING PHASE 

分 类 号：TN2[电子电信—物理电子学]