Multiple-band absorber enabled by new type of metamaterial resonator formed by metallic split ring embedded with rectangle patch

Abstract

Multiple-band perfect light absorber using new type of metamaterial resonator consisted of a metallic split ring embedded with a rectangle patch is designed in this paper. Four terahertz absorption peaks with narrow line-widths, large absorption coefficients, and discrete resonance frequencies are realized. The combined effect of multiple localized modes of the designed metamaterial resonator results in the quad-band near-unity absorption. Further results reveal that parameter changes of the metamaterial resonator provide the ability to tune the number of absorption peaks. Both the device design and its physical mechanism are different from the traditional design strategies of the multiple-band absorption devices, and thus the suggested scheme can offer an alternative design idea for multiple-band light absorbers and could have large application prospects, including the selective thermal radiation, thermal detection, imaging, spectrum enhancement, stealth technology, solar energy, sensing, etc.