Ultra-broadband, polarization-independent, wide-angle near-perfect absorber incorporating a one-dimensional meta-surface with refractory materials from UV to the near-infrared region
Heng Zhang, Minghui Luo, Yun Zhou, Yiqun Ji, Linsen Chen
Abstract
An ultra-broadband near-perfect absorber based on one-dimensional meta-surface utilizing refractory materials is proposed and demonstrated numerically. High absorptivity from UV to the near-infrared region (300-1200 nm) is attained for both transverse electric (TE) and transverse magnetic (TM) polarizations. For TE polarization, an average absorption of 96.0% with peak absorption up to 99.4% is attained. Simultaneously, an average absorption of 91.0% with peak absorption about 99.8% is achieved for TM polarization. Moreover, the high absorptivity can be maintained with incident angles up to 45°. The excellent performances are attributed to the trapping effect of the multiple resonance modes supported by the multi-layered structure. The ultra-broadband near-perfect absorber presented in this paper will provide a new method for realizing ultra-broadband polarization-independent absorption with a one-dimensional meta-surface, and has potential application prospects in color-printing, solar-energy harvesting, and other fields.