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- Title
Sensing Features of the Fano Resonance in an MIM Waveguide Coupled with an Elliptical Ring Resonant Cavity.
- Authors
Su, Hao; Yan, Shubin; Yang, Xiaoyu; Guo, Jing; Wang, Jinxi; Hua, Ertian
- Abstract
Featured Application: The values of the refractive index have a linear relationship with the concentration of hemoglobin at all wavelengths. By means of measuring the refractive index of the blood group, researchers can calculate the concentration of hemoglobin (g/L) within the erythrocytes, which is a vital parameter to detect the blood health condition. The Fano resonance relies on its advantage that it is sensitive to the changes of refractive indices, making it become a promising platform for designing highly integrated medical optical sensors to detect concentration of hemoglobin and monitor body health. In this article, a novel refractive index sensor composed of a metal–insulator–metal (MIM) waveguide with two rectangular stubs coupled with an elliptical ring resonator is proposed, the geometric parameters of which are controlled at a few hundreds of nanometer size. The transmission feature of the structure was studied by the finite element method based on electronic design automation (EDA) software COMSOL Multiphysics 5.4 (Stockholm, Sweden). The rectangular stub resonator can be thought of as a Fabry–Perot (FP) cavity, which can facilitate the Fano resonance. The simulation results reveal that the structure has a symmetric Lorentzian resonance, as well as an ultrasharp and asymmetrical Fano resonance. By adjusting the geometrical parameters, the sensitivity and figure of merit (FOM) of the structure can be optimized flexibly. After adjustments and optimization, the maximum sensitivity can reach up to 1550 nm/RIU (nanometer/Refractive Index Unit) and its FOM is 43.05. This structure presented in this article also has a promising application in highly integrated medical optical sensors to detect the concentration of hemoglobin and monitor body health.
- Subjects
REFRACTIVE index; FANO resonance; ELECTRONIC design automation; BLOOD groups; ERYTHROCYTES; FINITE element method; OPTICAL sensors; BLOOD group antigens
- Publication
Applied Sciences (2076-3417), 2020, Vol 10, Issue 15, p5096
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app10155096