中国光学（中英文）2026，Vol.19Issue(2)：267-276,10.DOI:10.37188/CO.2025-0158
基于法诺共振的全介质硫系化合物超表面高性能中红外折射率传感
All-dielectric chalcogenide metasurfaces based on Fano resonance for high-performance mid-infrared refractive index sensing
摘要
Abstract
We propose a high-performance mid-infrared refractive index sensor based on an all-dielectric metasurface,operating at a wavelength of approximately 5.36 μm.The metasurface unit consists of four sym-metrically arranged Sb2Se3 semi-elliptical structures and a central Sb2Se3 cylinder,periodically arranged on a BaF2 substrate.Numerical simulations were performed using the finite-difference time-domain(FDTD)method to obtain the reflection spectrum and to analyze the electromagnetic field vector distribution at the resonance peak,as well as the influence of geometric parameters on the spectral response.The observed Fano resonance in the reflection spectrum is explained by the theory of quasi-bound states in the continuum(Q-BIC).Through systematic parameter scanning,we investigate the influence of structural parameters on the quality factor(Q)and full width at half-maximum(FWHM)under the constraint of fixed resonance intensity,and compare the spectral linewidth responses when adjusting parameters in different directions.Furthermore,by varying the background refractive index,the refractive-index sensing characteristics based on the Fano resonance are studied.The results show that the sensor achieves a maximum sensitivity of 1 985 nm/RIU,a peak Q-factor of 1 096.6,and a figure of merit(FOM)of 400.Compared with previously reported mid-in-frared refractive index sensors,the proposed design demonstrates significant advantages in key performance metrics such as sensitivity,Q-factor,and FOM.This work provides a feasible design strategy and perform-ance reference for developing high-performance mid-infrared optical sensors based on chalcogenide com-pounds.关键词
全介质超表面/折射率传感/准连续域束缚态/中红外/硫系化合物Key words
all-dielectric meta-surface/refractive index sensing/quasi-bound states in the continuum/mid-infrared/chalcogenide compounds分类
数理科学引用本文复制引用
许诺,黄虎钧,郭万祺,姜湖,王莹莹,张培晴,沈祥,戴世勋,宋宝安..基于法诺共振的全介质硫系化合物超表面高性能中红外折射率传感[J].中国光学（中英文）,2026,19(2):267-276,10.基金项目
国家自然科学基金(No.62135011) （No.62135011）
宁波市自然科学基金(No.2024J024)Supported by National Natural Science Foundation of China(No.62135011) （No.2024J024）
Ningbo Natural Science Founda-tion(No.2024J024) （No.2024J024）
