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Compact and Sensitive H-Shaped Metal-Dielectric-Metal Waveguide Plasmonic Sensor

机译:Compact and Sensitive H-Shaped Metal-Dielectric-Metal Waveguide Plasmonic Sensor

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摘要

In this study, we designed and evaluated a sensing architecture using a metal-insulator-metal waveguide connected to an H-shape resonator for refractive index change measurement in two unique bands of refractive index: n= 1.8-1.95 and n= 2.1-2.3. A 3-D finite element approach is used to investigate the device sensing characteristics. For the waveguide, the H-shape resonator offers a cavity resonance zone where the substance to be detected is filled. The transmission curve plot revealed that the suggested arrangement generates two resonant dips. The resonant wavelength was found to have a direct and linear relationship with the refractive index of the material being sensed, the length of vertical height, and the width of the cavity's mid-arm. Sensitivity and figure of merit have the highest values of 1007.78 nm/RIU and 29 RIU-1 , respectively. The highest quality-factor obtained was 60. The proposed structure can be employed for refractive index sensing at the nanometer scale and increasing spectroscopy applications since it has features like nano size, high sensitivity, a linear relationship between tuning parameters, and a larger sensing span.

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