Add to BibSonomy
Abstract
An all-dielectric Fano resonance sensor is proposed, and its sensing characteristics are numerically investigated in the near-infrared region. The proposed device comprises two planar waveguides and a grating. The coupling between high- and low-quality-factor guided modes of the waveguides leads to a sharp Fano resonance at the optical communication wavelength of $\lambda = {1550}\;{\rm nm}$. Owing to the transparency of constituent dielectric layers in the near-infrared region, a sharp, low-loss Fano resonance appears in the reflection spectrum, which is favorable in sensing applications. The proposed sensor can detect small changes in the refractive index of the sensing medium as low as $\Delta n = {0.001}$. The high sensitivity of a structure is promising in biochemical applications, such as measuring the refractive indices of organic solvents, the level of water content in ethanol and aqueous solutions, and blood glucose levels. The refractive index sensitivity is as high as ${S_I} = {999}\;{{\rm RIU}^{- 1}}$, and a figure of merit of ${{\rm FOM}} = {1000}$ is achieved.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Chen Zhao, Yiping Huo, Tong Liu, Zuxiong Liao, Congmu Xu, and Tao Zhang
J. Opt. Soc. Am. B 41(1) 36-45 (2024)
Huawei Chen, Xinye Fan, Wenjing Fang, Bingyuan Zhang, Shuangshuang Cao, Qinghe Sun, Dandan Wang, Huijuan Niu, Chuanchuan Li, Xin Wei, Chenglin Bai, and Santosh Kumar
Biomed. Opt. Express 15(1) 294-305 (2024)
Gaurav Kumar Yadav and Sanjeev Kumar Metya
J. Opt. Soc. Am. B 41(1) 175-182 (2024)