Single Metamaterial Resonator Having Five-Band Terahertz Near-Perfect Absorption

New strategy to achieve a simple design of a five-band terahertz absorber is demonstrated. We take a sandwiched metamaterial structure as the study object, which is consisted of an array of Au resonator and a dielectric spacing layer on top of an opaque Au board. Five distinct but large absorption rates of peaks are realized. The combination of the five modes in different sections of the device determines the multiple-band absorption. Field distributions of these modes are given to insight into their physical mechanism. The five-band absorber gives important potentials to develop integrated terahertz devices.