DNG Angle Independent UV-NIR Metamaterial Absorber Enabled by Walsh Matrix

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2022
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An effective way to absorb electromagnetic radiation, such as light, is via a metamaterial absorber. Consequently, those metamaterials that are intended to function as absorbers provide advantages over traditional absorbers, such as additional downsizing, a larger range of flexibility, and increased efficacy. Emitters, photodetectors, sensors, spatial light modulators, infrared camouflage, wireless communication, and use in solar photovoltaics and thermophotovoltaics are some of the intended uses for the metamaterial absorber. A block of material called a Metamaterial absorber, which typically has three layers, is utilized to absorb some of the energy of impact particles. MMAs are also known as perfect absorbers because they exhibit near-uniform absorption and zero transmission and reflection coefficients for incident plane waves. The Walsh matrices are a special case of Hadamard matrices. The Walsh matrix (and Walsh functions) are used in computing the Walsh transform and have applications in the efficient implementation of certain signal processing operations. The Walsh matrix is a particular square matrix with dimensions 2^n, where ‘n’- is a certain natural number. The shown MM absorber (WMMA) exhibits absorption of a maximum of 99.99% for both the transverse electric (TE) mode and the transverse magnetic (TM) mode not only in the optical domain but also near the Infrared domain. In addition, a variety of parametric sweeps, current distributions, and electric and magnetic field properties have all been studied. Applications for this MM absorber, which is based on the Walsh matrix arrangement (WMMA) include filtering, power spectrum analysis, Image processing.
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Electrical and Computer Engineering
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North South University
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