Triple-band terahertz metamaterial absorber

We report on the design and characterisation of a triple-band terahertz (THz) metamaterial absorber (MA). We use the equivalent transmission line (TL) circuit model analysis to define the triple-band THz MA dimensions, which makes it easy and straightforward to derive a set of procedures of designing an arbitrary MA from a TL circuit model. Through changing the self-inductance in proposed MA, we can adjust the fundamental resonant frequency independently. From the presented simulation results, three nearly unity absorption peaks are observed at frequencies of 0.22THz, 0.68THz and 1.10THz. We also prove the good performance of proposed MA no matter how much the oblique incident wave angle changes within a large range. This feature of wide accepted angles is promising in many application areas.