Metamaterials (MM) are artificially designed materials that possess unique properties due to their geometrical design. They also display some peculiar properties, such as negative refractive index, Snell’s law reversal, Doppler effect reverse, and left-handed behavior. MMs are used in a myriad of applications, including invisibility cloaking, perfect lensing, perfect absorption, and sensing. In this review article, the property of electromagnetic absorption by structures known as metamaterial absorbers (MMAs) is discussed. An MMA is a composite made up of many layers of metallic patterns separated by dielectric. This novel device helps in achieving near-unity absorption by various mechanisms, which are investigated in this article. The MMAs are classified based on their absorption characteristics, such as polarization tunability, broadband operation, and multiband absorption, in different frequency regimes.
A novel terahertz metamaterial absorber design with broadband and polarization insensitive absorption characteristics is presented in this paper. This proposed unit cell structure consists of a single layer dielectric with a petal-shaped metallic patch on the top plane. It is found that the absorber offers a broadband absorption of more than 90% over a frequency ranging from 2.6 to 3.5 THz. The absorption mechanism, electric field distribution and parametric analysis for the observed broadband response are also investigated in this paper. The strong coupling effect in the petal-shaped structure contributes to the broadening of the absorption spectrum. Thus, the proposed single-layer absorber can have effective application in terahertz broadband applications.
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