Design of a concise and dual-band tunable metamaterial absorber

We theoretically present a concise and tunable dual-band metamaterial absorber composed of a typical metaldielectric-metal structure in the terahertz regime.The dual-band absorption originates from two different resonance modes induced in one square ring,which is different from the common dual-band absorber composed of a super unit with several different-sized structures.The proposed absorber can realize dynamic tunability through changing the permittivity of the dielectric layer by applying different temperatures.Other good performances,such as a wide incident angle and polarization insensitivity,are also available for the proposed absorber.Such a metamaterial absorber is a promising candidate for terahertz imaging and detection.