A Broadband Polarization Insensitive Metamaterial Absorber Using Petal-Shaped Structure.

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. [ABSTRACT FROM AUTHOR]