Novel polarization independent multiband THz perfect metamaterial

Abstract

The design and characterization of a multiband THz metamaterial are reported in this article. The proposed metamaterial is constructed over the polyimide substrate embedded with a novel ring-shaped frequency-sensitive copper trace on the top providing the desired frequency response. The proposed metamaterial is developed from a unit cell with a base cross shape. The arms of the cross shape are deployed with three folded circular resonators providing the desired frequency-selective property. The proposed metamaterial offers band-stop characteristics at 0.83, 2.15, 2.91, 4.1, and 4.86 THz. The proposed unit cell metamaterial has the smallest foot-print of 0.089λ o  0.089λ o where λ o is the free-space wavelength. The electric field distribution and surface current contours are used to describe the operation of the proposed metamaterial. The proposed metamaterial has a symmetric configuration resulting in a polarizationindependent operation. The angular stability of the proposed metamaterial is investigated by subjecting the metamaterial to the various oblique incidence of THz radiation. The proposed THz metamaterial unit cell is suitable for THz imaging and spectroscopy applications.