Ultra-Sensitive Refractive Index Sensing Based on Quasi-BICs in All-Dielectric Nanorod Array

被引:1
|
作者
Zhao, Yuefeng [1 ,2 ,3 ]
Wu, Zhenghua [1 ,2 ,3 ]
Feng, Zhihao [1 ,2 ,3 ]
Ning, Tingyin [1 ,2 ,3 ]
机构
[1] Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Engn & Tech Ctr Light Manipulat, Jinan 250358, Peoples R China
[2] Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Opt & Photon Device, Jinan 250358, Peoples R China
[3] Shandong Normal Univ, Collaborat Innovat Ctr Light Manipulat & Applicat, Jinan 250358, Peoples R China
基金
中国国家自然科学基金;
关键词
bound states in the continuum; high-Q factor; sensor; MULTIPLE FANO RESONANCES; BOUND-STATES; SENSOR; METASURFACES; BIOSENSORS; FIBER;
D O I
10.3390/photonics11060503
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We propose an all-dielectric nanorod array for ultra-sensitive refractive index sensing based on quasi-bound states in the continuum (BICs). The nanorod is fabricated by silicon or silicon with an air hole, i.e., the hollow silicon nanorod. The quasi-BICs are formed in the hollow silicon nanorod array due to the symmetry-breaking of air holes. The high-quality factor (Q-factor) and ultra-narrow reflectance spectral width at quasi-BICs contribute to high performances of the sensor. The numerical results show that the sensitivity and figure of merit (FOM) can reach up to 602.9 nm/RIU and 34,977, respectively. The results indicate that the proposed nanostructures of quasi-BICs are promising for advanced biosensing applications.
引用
收藏
页数:12
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