Dual-Band Chiral Nonlinear Metasurface Supported by Quasibound States in the Continuum

被引:16
作者
Liu, Qing-Song [1 ,2 ]
Chao, Ming-Hao [1 ,2 ]
Zhang, Wen-Jing [1 ,2 ]
Song, Guo-Feng [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China
[2] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
bound states in the continuum; chirality; nonlinear metasurface; 2ND-HARMONIC GENERATION;
D O I
10.1002/andp.202200263
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
This paper presents an all-dielectric chiral metasurface composed of an array of two-layer distorted square structures with nanoholes. This metasurface can simultaneously generate dual-band opposite chiral responses, which can be attributed to the bound states in the continuum (BICs) and the distorted chiral structure. By combining the BICs with chirality, a dual-band chiral nonlinear metasurface and a chiral-sensing method are proposed. The simulated results show that the third harmonic generation (THG) conversion efficiency can reach the order of 10(-4) for two peaks with a peak-pump intensity of approximately 5.3 GW cm(-2) in the near-infrared region. Moreover, the third-harmonic circular dichroism for each peak can reach up to 0.99 and -0.94, respectively. Furthermore, it is theoretically demonstrated that this metasurface can be used for chiral sensing with high sensitivities. These results provide new insights for linear and nonlinear spin-dependent applications.
引用
收藏
页数:9
相关论文
empty
未找到相关数据