High-Q Fano resonances in all-dielectric metastructures for enhanced optical biosensing applications

被引:13
|
作者
Chen, Huawei [1 ]
Fan, Xinye [1 ,2 ,3 ,4 ]
Fang, Wenjing [1 ,3 ,4 ]
Zhang, Bingyuan [1 ,3 ]
Cao, Shuangshuang [1 ]
Sun, Qinghe [1 ]
Wang, Dandan [1 ]
Niu, Huijuan [1 ,3 ,4 ]
Li, Chuanchuan [1 ,2 ]
Wei, Xin [2 ]
Bai, Chenglin [1 ,3 ,4 ]
Kumar, Santosh [1 ,3 ,5 ]
机构
[1] Liaocheng Univ, Sch Phys Sci & Informat Engn, Liaocheng 252000, Peoples R China
[2] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China
[3] Shandong Prov Key Lab Opt Commun Sci & Technol, Liaocheng 252000, Peoples R China
[4] Liaocheng Key Lab Ind Internet Res & Applicat, Liaocheng 252000, Peoples R China
[5] KL Deemed Univ, Dept Elect & Commun Engn, Guntur 522302, Andhra Prades, India
关键词
HIGH-SENSITIVITY; BOUND-STATES; EXCITATION;
D O I
10.1364/BOE.510149
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Fano resonance with high Q-factor is considered to play an important role in the field of refractive index sensing. In this paper, we theoretically and experimentally investigate a refractive index sensor with high performance, realizing a new approach to excite multiple Fano resonances of high Q-factor by introducing an asymmetric parameter to generate a quasi-bound state in the continuum (BIC). Combined with the electromagnetic properties, the formation mechanism of Fano resonances in multiple different excitation modes is analyzed and the resonant modes of the three resonant peaks are analyzed as toroidal dipole (TD), magnetic quadrupole (MQ), and magnetic dipole (MD), respectively. The simulation results show that the proposed metastructure has excellent sensing properties with a Q-factor of 3668, sensitivity of 350 nm/RIU, and figure of merit (FOM) of 1000. Furthermore, the metastructure has been fabricated and investigated experimentally, and the result shows that its maximum Q-factor, sensitivity and FOM can reach 634, 233 nm/RIU and 115, respectively. The proposed metastructure is believed to further contribute to the development of biosensors, nonlinear optics, and lasers.
引用
收藏
页码:294 / 305
页数:12
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