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

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 degrees. 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. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement