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http://dx.doi.org/10.7236/JIIBC.2022.22.2.129

Diffraction Characteristics for Optical Bio-Sensor of Bi-level Grating with Mushroom Profile  

Ho, Kwang-Chun (Electronics Track, Hansung University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.22, no.2, 2022 , pp. 129-134 More about this Journal
Abstract
The resonant bio-sensor of bi-level grating structure with mushroom profile has been designed for operating in the near-infrared (NIR) wavelength range under transverse electric (TE) polarization. The rigorous modal transmission-line theory (MTLT) is applied to determine the optical characteristics, and the reflection resonance of the grating structure is analyzed by varying their geometrical parameters. The numerical result shows that an excited sharp Fano resonance (FR), which does not occur in single layer grating, is demonstrated. The relationship between structure parameters of bi-level grating and the reflectance spectrum in order to guarantee the appearance of FR in the designed structure is fully investigated. An optical bio-sensor with a potential sensitivity of 112.9~214.3 deg/RIU and 447 nm/RIU is designed based on the proposed structure. The proposed mushroom profile may serve as a powerful sample for the design of optical bio-sensors with a wide range of applications.
Keywords
Optical Bio-Sensor; Bi-Level Grating; Fano Resonance;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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