Broadband plasmonic absorber based on all silicon nanostructure resonators in visible region

Abstract

We present a broadband plasmonic absorber (PA) based on all silicon nanostructure resonators in visible region, which can be functioned as metamaterial (MM) blackbody for nearly all light radiation. Distinct from previous designs, the proposed PA is only consisted of periodic all silicon circular-split-ring (CSR) nanostructure resonators array adhered on a continuous gold substrate. Simulation results indicate that the absorbance of the proposed PA is greater 98% from 514 THz to 638 THz, and the absorption peak is up to 99.9% at 520 THz and 626.5 THz, respectively. The proposed PA is polarization-insensitive and toleration of wide incident angles for both transverse electric (TE) and transverse magnetic (TM) modes. In addition, the designed PA can tolerate some geometric parameters errors in fabrication. Thus, the proposed PA for MM blackbody can be potential application in the photodetectors, thermal imaging, photoelectrochemical, and solar energy harvesting devices.