Penta-band terahertz light absorber using five localized resonance responses of three patterned resonators

It is quite urgent to obtain multiple-band light absorbers because they are of great important in many technology related fields. However, the realization of them is typically based on a plurality of resonators which are at least equal to the number of absorption peaks. Here an alternative structure design to reduce the number of the resonators for multiple-band light absorption at terahertz regime is demonstrated. The obtained results exhibit that penta-band terahertz light absorber with large absorption intensity and discrete frequency point is realized using five localized resonance responses in only three resonators (composed of two parallel arranged bars and a square patch). Near field patterns of the penta-band terahertz light absorber are given to clarify the absorption mechanism of each frequency point. We further explore and analyze the influence of the geometric parameters of the structure design on the performance of the penta-band light absorption.