Dynamically tunable coherent perfect absorption and transparency in Dirac semimetal metasurface

Abstract

We investigate the coherent absorption properties of bulk Dirac semimetal (BDS) metasurfaces. The calculation results show that two coherent beams with the same intensity are irradiated from the opposite direction to the BDS metasurface, inducing the surface plasmon resonance in the terahertz band. By adjusting their relative phase, the absorption intensity can almost be tuned consecutively from 99.95% to less than 0.01%. In addition, the intensity and peak frequency of the coherent absorption can be dynamically adjusted through Fermi energy of the BDS metasurface, with the frequency shifting from 1.24 to 1.36 THz. This research shows that BDS has potential application prospects in the design of coherent detectors and modulators.