A Wide-Band, Polarization-Insensitive and Wide-Angle Terahertz Metamaterial Absorber

In this paper, a wide-band, polarization-insensitive, wide- angle terahertz metamaterial absorber is presented. Simulated results show that the absorber can achieve polarization-insensitive, wide-angle absorptions in a wide band from 4.15 to 4.85THz. The retrieved impedance shows that the impedance of the absorber could be tuned, in the absorption band, to match approximatively that of free space on one side and to mismatch on the other side, rendering both the re∞ectance and transmission minimal and thus the corresponding absorbance maximal. The simulated absorbances under three difierent