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- Title
High-Performance Refractive Index and Temperature Sensing Based on Toroidal Dipole in All-Dielectric Metasurface.
- Authors
Zhao, Jingjing; Fan, Xinye; Fang, Wenjing; Xiao, Wenxing; Sun, Fangxin; Li, Chuanchuan; Wei, Xin; Tao, Jifang; Wang, Yanling; Kumar, Santosh
- Abstract
This article shows an all-dielectric metasurface consisting of "H"-shaped silicon disks with tilted splitting gaps, which can detect the temperature and refractive index (RI). By introducing asymmetry parameters that excite the quasi-BIC, there are three distinct Fano resonances with nearly 100% modulation depth, and the maximal quality factor (Q-factor) is over 104. The predominant roles of different electromagnetic excitations in three distinct modes are demonstrated through near-field analysis and multipole decomposition. A numerical analysis of resonance response based on different refractive indices reveals a RI sensitivity of 262 nm/RIU and figure of merit (FOM) of 2183 RIU−1. This sensor can detect temperature fluctuations with a temperature sensitivity of 59.5 pm/k. The proposed metasurface provides a novel method to induce powerful TD resonances and offers possibilities for the design of high-performance sensors.
- Subjects
REFRACTIVE index; FANO resonance; QUALITY factor; TEMPERATURE; NUMERICAL analysis; RESONANCE
- Publication
Sensors (14248220), 2024, Vol 24, Issue 12, p3943
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s24123943