Studying Quasi-Parametric Amplifications: From Multiple PT-Symmetric Phase Transitions to Non-Hermitian Sensing
Year: 2024
Type: article
Abstract: Quasi-parametric amplification (QPA) is a nonlinear interaction in which the idler wave is depleted through a loss mechanism. QPA plays an important role in signal amplification in ultrafast photonics and quantum light generation. In this report, we explore the generalized features characterized by non-Hermitian parity-time ( PT ) symmetry in the QPA process and uncover multiple PT -symmetric phase transitions in such a QPA process in which transitions are ultrasensitive to external parameters. In particular, we demonstrate the feasibility of detection of 10 –11 inhomogeneities of the doped absorber, which is several orders of magnitude more sensitive than similar measurements performed in a linear absorption regime. In doing so, we reveal a family of PT -symmetric phase transitions appearing in the QPA process and provide a distinctive nonlinear optical sensing mechanism for precise optical measurements.
Source: ACS Photonics
Authors: Xiaoxiong Wu, Kai Bai, Penghong Yu, Zhaohui Dong, Yanyan He, Jingui Ma, Vladislav V. Yakovlev, Meng Xiao, Xianfeng Chen, Luqi Yuan
Institutions: Shanghai Jiao Tong University, State Key Laboratory of Advanced Optical Communication Systems and Networks, State Key Laboratory of Advanced Optical Communication Systems and Networks, Wuhan University, Texas A&M University, Wuhan Institute of Quantum Technology, Shandong Normal University, Jinan Institute of Quantum Technology
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4403243543