Dielectric and metallic metasurfaces are proposed to demonstrate the sensing applications in the near-infrared region under normal incidence light. The geometrical parameters of the proposed metasurfaces are designed using Rigorous coupled analysis under wavelength interrogation, and the results are verified using Comsol Multiphysics software. A layer of 2D nanomaterial (MoS2) is considered to increase the adsorption on the sensing surface. Aluminum-based metallic metasurfaces offer a sensitivity of 1100nm/RIU with a figure of merit of 250 RIU-1. The proposed metasurfaces are further used for the detection of cancer cells in human blood, and a red shift in the wavelength spectra is observed due to the increase in the refractive index.
We present surface plasmon resonance-based sensing devices with Aluminum (Al) as the plasmonic metal in the near-infrared region and analyze the output performances in terms of higher sensitivity and the Figure of Merit (FOM). The optical characteristics of Al-based plasmonic sensors are explored using different interrogation modes (angle and wavelength). Biorecognition elements help to enhance the sensor’s performance, for which 2D nanomaterials are explored for the biofunctionalization of the top surface. In the end, we also present an Al-based plasmonic device that utilizes both prism and nanostructure-based configurations, and the same designed parameters for the device offer high sensitivity and FOM in both angle and wavelength interrogation.
We engineer an Aluminum (Al)-based plasmonic device coated with TiO2 and SiO2 layers for biosensing applications. First, the thicknesses of TiO2, SiO2, and Al layers are optimized under the angle interrogation scheme for a wavelength of 1550 nm. Over an optimized value of TiO2, SiO2, and Al film thickness, the variation trend in the performance parameters is studied for a range of thicknesses of 2D nanomaterials for the biofunctionalization of the sensing surface. Later, with the optimized intermediate layers, we present a comparative analysis of Al-based Kretschmann configuration with Graphene, MoS2, MXene, and Fluorinated Graphene. It is observed that the TiO2-SiO2-Al-Fluorinated Graphene-based plasmonic device provides enhanced sensing parameters (sensitivity =120°/RIU, Figure of Merit = 430 RIU-1).
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