折射率
功勋
谐振器
光学
电介质
分裂环谐振器
Q系数
灵敏度(控制系统)
光电子学
材料科学
半最大全宽
共振(粒子物理)
物理
原子物理学
电子工程
工程类
作者
Mohsen Samadi,Fatemeh Abshari,J. F. Algorri,Pablo Roldán-Varona,L. Rodŕıguez-Cobo,José Miguel López Higuera,José Manuel Sánchez‐Pena,Dimitrios C. Zografopoulos,Francesco Dell’Olio
摘要
All-dielectric metasurfaces have attracted increasing attention due to their negligible losses and sharper resonances compared to their metallic counterparts. In this work, we numerically studied the optical performance of a novel alldielectric metasurface based on complementary split-ring resonators (CSRRs), in which ultrathin slots were periodically etched in a thin silicon layer. The proposed CSRR metasurface exhibits two multipolar resonances in the near-infrared (NIR) window. Moreover, a quasi-bound state in the continuum (quasi-BIC) with an ultra-high quality factor can be excited by breaking the symmetry of the structure. Taking advantage of the high-quality factor quasi-BIC mode and its sensitivity to the superstrate medium refractive index (S = Δλres/Δn), we design an ultra-high figure of merit (FoM = S/FWHM) refractive index sensor for biomedical applications. By three-dimensional finite element method (3D-FEM), we evaluate the sensitivity of the sensing device to the variation of the superstrate refractive index in the range 1.31-1.33, which is typical for aqueous solutions. Our simulations reveal that a sensitivity of S ~ 155 nm RIU-1 and an extraordinary FoM ~ 387500 RIU-1 can be achieved using the ultra-narrow quasi-BIC resonance in the CSRR metasurface structure. The proposed approach opens new paths to develop flat biochemical sensors with high accuracy and real-time performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI