Tunable Terahertz Absorber Based on Bulk-Dirac-Semimetal Metasurface

IEEE Photonics Journal

Yannan Jiang¹  Jiao Wang¹  Wan Xinguo¹  Jia Wang² 

[1] Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin, China;School of Computer Science and Engineering, Southeast University, Nanjing, China;

关键词: Absorber;    metasurface;    bulk Dirac semimetal (BDS).;   

DOI  :  10.1109/JPHOT.2018.2866281

来源: DOAJ

【 摘 要 】

We propose a tunable terahertz (THz) absorber design that utilizes a bulk Dirac semimetal (BDS)-based metasurface. The absorber consists of a BDS film with a periodic ring slot, dielectric layer, and fully reflective gold mirror. Simulations indicate that localized surface plasmon resonance is excited within certain regions close to the ring slot, leading to dipolar plasmon resonance of periodic arrays along the polarization direction, thereby producing resonant absorption. The BDS conductivity scales linearly with the Fermi level that can be tuned by bias application, enhancing the electromagnetic-field concentration and shrinking the effective current path, thereby blue-shifting the operating frequency within an ultrawideband. The thickness of the proposed design is significantly less than the resonant wavelength; therefore, the design yields an ultrathin metasurface absorber. This paper may lead to the investigations of the tunable metasurface device based on the BDS.

【 授权许可】

Unknown