Topologically enabled ultrahigh-Q chiroptical resonances by merging bound states in the continuum

被引:27
|
作者
Wan, Shun [1 ]
Wang, Keda [1 ]
Wang, Fatian [1 ]
Guan, Chunying [1 ]
Li, Wenjia [1 ]
Liu, Jianlong [1 ]
Bogdanov, Andrey [2 ]
Belov, Pavel A. [2 ]
Shi, Jinhui [1 ]
机构
[1] Harbin Engn Univ, Coll Phys & Optoelect Engn, Minist Educ, Key Lab In Fiber Integrated Opt, Harbin 150001, Peoples R China
[2] ITMO Univ, Sch Phys & Engn, St Petersburg 191002, Russia
基金
俄罗斯科学基金会; 中国国家自然科学基金;
关键词
Merging;
D O I
10.1364/OL.462021
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Ultrahigh-Q chiroptical resonance metasurfaces based on merging bound states in the continuum (BICs) are investigated and numerically demonstrated. The destruction of C-2 symmetry results in the leakage of BICs into quasi-BICs, and a chiral quasi-BIC is obtained by oblique incidence or continuous destruction of the mirror symmetry of the structure. Due to the significant topological properties of merging BICs, the Q factor (over 2x10(5)) of the chiral resonance peak obtained is much higher than that of the previous work. Moreover, the proposed structure is easy to fabricate because no additional out-of-plane asymmetry is introduced. The proposed scheme is of importance in chiral biosensing applications. (C) 2022 Optica Publishing Group
引用
收藏
页码:3291 / 3294
页数:4
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