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

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 arr...

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Bibliographic Details
Published inPhotonics Vol. 11; no. 6; p. 503
Main Authors Zhao, Yuefeng, Wu, Zhenghua, Feng, Zhihao, Ning, Tingyin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2024
Subjects
Arrays
Asymmetry
Biosensors
bound states in the continuum
Broken symmetry
Electric fields
Electromagnetism
Figure of merit
high-Q factor
Nanorods
Performance evaluation
Q factors
Refractivity
sensor
Sensors
Silicon
Symmetry
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Summary: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.
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ISSN:2304-6732
2304-6732
DOI:10.3390/photonics11060503