Active control of parity-time symmetry phase transition in terahertz metasurface

被引:8
|
作者
Wang, Junxing [1 ,2 ]
Shen, Yun [1 ,2 ]
Yu, Xin [1 ,2 ]
Zou, Liner [1 ,2 ]
Ouyang, Shoujian [1 ,2 ]
Deng, Xiaohua [2 ]
机构
[1] Nanchang Univ, Dept Phys, Nanchang 330031, Jiangxi, Peoples R China
[2] Nanchang Univ, Inst Space Sci & Technol, Nanchang 330031, Jiangxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Non-Hermitian metasurface; Exceptional point; PT-symmetry; Terahertz; INDUCED TRANSPARENCY; EXCEPTIONAL POINT; LASER;
D O I
10.1016/j.physleta.2021.127304
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Parity-time (PT) symmetry breaking in polarization space is investigated in a non-Hermitian terahertz metasurface system. In which the unit cell consists of two orthogonally oriented split-ring resonators with same resonant frequency but different loss coefficients. By tuning the conductivity of silicon island in the gap of one split-ring resonators, a phase transition is observable via both transmission spectra and polarization of the eigenstates. Specifically, as conductivity is 1600 Sm-1, the two eigentransmission spectra coincided and only a left circularly polarized state is obtained, indicating exceptional point appearance. For conductivity below and upon 1600 Sm-1, PT-symmetry and PT breaking regimes are separately provided. (C) 2021 Published by Elsevier B.V.
引用
收藏
页数:4
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