Meta material absorber in Optical regime

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2022
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Abstract
A metamaterial absorber (MMA) enables a variety of applications for this region, including real invisible cloaks, color imaging, magnetic resonance imaging, light trapping, plasmonic sensor, light detector, and thermal imaging applications. Optical wavelengths are thought to be the primary source of electromagnetic waves from the sun. In this study, a novel wide-angle, polarization-insensitive MMA is presented in consideration of those applications. The structure of the three layers of the absorber was a sandwiched metal-dielectric-metal construction. This metamaterial absorber creation demonstrated a good impedance match with plasmonic resonance properties. The FIT was used to simulate the structure, and the FEM was used to validate it. In order to achieve the best physical dimension, numerous parametric analyses were carried out with the design. Multiple important analyses have also greatly contributed to the explanation of the absorption mechanism. The layout was average. In this article, a broadband metamaterial (MTM) absorber with near-unity terahertz absorption is suggested. The resonator and backplane are made of tungsten, while the proposed metamaterial absorber was initially developed on a quartz (fused) substrate. The resonator is built with a face-to- face E structure loaded into the middle of a square ring. Additionally, it includes a concave-shaped structure that extends from the center of the square ring and diagonally extended arrow-like structures loaded from the corners. Absorption peaks of 99.8 percent, 99.9 percent, 99.92 percent, and 762.8 percent, respectively, are seen at frequencies of 465.2 THz, 585.2 THz, 648.8 THz, and 762.8 THz. Additionally, it displays broadband absorption characteristics with bandwidths of 20.4 THz, 80.8 THz, 41.6 THz, and 90% absorption. The proposed is useful for solar energy harvesting, solar cells, and solar thermophotovoltaics since it is wide-angle independent up to 60° for both TE and TM mode (STPV). This MMA can serve as a light detector or an optical sensor. Additionally, this suggested design can be used in several of the aforementioned applications
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Electrical and Computer Engineering
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North South University
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