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

来源：

OPTICS LETTERS | 2022年 / 47卷 / 13期

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

页码：3291 / 3294

页数：4

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