Multiple-Band Metamaterial Absorbers of Terahertz Range

The paper is concerned with a three constructions of multiple-band metamaterial absorbers of terahertz (THz) range. In this paper, an absorber with two nested split ring resonators (SRRs) is introduced that its absorption spectrum has three absorption peaks by the values of 99,8%, 97,52%, and 94,98% at the frequencies of 8,5; 14,7 and 23,9 THz, respectively. A design approach for achieving quadband terahertz metamaterial absorber is demonstrated. Results show that the absorber has four high absorption (greater than 98%) resonance bands (or peaks). A strategy to achieve a simple design of a five-band terahertz absorber is demonstrated. Five distinct but large absorption rates of peaks are review. The combination of the five modes in different sections of the device determines the multipleband absorption.