WIDE-ANGLE, AZIMUTHAL ANGLE-INDEPENDENT AND DUAL-BAND INFRARED METAMATERIAL ABSORBER BASED ON ASYMMETRIC STRUCTURE

Abstract

A wide-angle, azimuthal angle-independent and dual-band metamaterial absorber in the mid infrared region is proposed which is made of copper and SiC. SiC dielectric is sandwiched between a copper layer at the bottom and a design made of copper on the top. For the proposed metamaterial absorber, simulation results show absorption peaks at two different wavelengths. It is due to magnetic polariton modes produced at those two wavelengths of mid-infrared region. Moreover, the simulation results also show a good impedance matching the metamaterial absorber and the air (or vacuum). Good absorption by the proposed structure has been observed for incident angles 𝜃 spanning from 0˚ to 80˚ at azimuthal incident angle 𝜙 = 0˚ and 90˚ for both TE and TM incidences. In addition, the proposed structure also shows good absorption for azimuthal incident angles 𝜙 spanning from 0˚ to 180˚ at 𝜃 = 45˚ because perpendicular magnetic polariton modes were excited within the proposed asymmetric structure. Therefore, the proposed structure can be used for applications in infrared spectroscopy and imaging.