All-dielectric metastructure based on multiple Fano resonances with high sensitivity

被引：6

作者：

Zhao, Hening ^{[1
]}

Fan, Xinye ^{[1
,2
]}

Wei, Xin ^{[2
]}

Li, ChuanChuan ^{[2
]}

Bi, Liping ^{[1
]}

Fang, Wenjing ^{[1
,3
]}

Niu, Huijuan ^{[1
,3
]}

Bai, Chenglin ^{[1
,3
]}

Tao, Jifang ^{[4
]}

机构：

[1] Liaocheng Univ, Sch Phys Sci & Informat Technol, Liaocheng, Peoples R China

[2] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China

[3] Liaocheng Univ, Shandong Prov Key Lab Opt Commun Sci & Technol, Liaocheng, Peoples R China

[4] Shandong Univ, Sch Informat Sci & Engn, Qingdao 266237, Peoples R China

来源：

OPTICS COMMUNICATIONS | 2023年 / 530卷

关键词：

All-dielectric metastructure; Multi-Fano resonances; High sensitivity; Optical refractive sensor; REFRACTIVE-INDEX SENSOR; BOUND-STATES; METASURFACES; CONTINUUM;

D O I：

10.1016/j.optcom.2022.129193

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Fano resonance with narrow linewidth through the theory of quasi-bound states in the continuum (quasi-BIC) plays an effective role in the field of optical sensors. In this paper, an all-dielectric metastructure is proposed which consists of two silicon-notched cylinders (TSNC) in the unit cell to design an optical refractive sensor with multiple and sharp Fano resonances. By breaking the symmetry, TSNC are used to excite four Fano resonances by toroidal dipole (TD), in which the maximum of Q-factor is 1320. Particularly, the sensitivity of the optical refractive sensor can reach 652 nm/RIU. It is believed that the optical refractive sensor based on the TSNC can be widely used in biomedical, agricultural and chemical sensing fields due to its high sensitivity.

引用

页数：7

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