Abstract
A tunable triple-band absorber based on bulk-Dirac-semimetal (BDS) metasurface is proposed in the terahertz (THz) range. The design is comprised of a BDS film with a pattern of dual ring slots and a dielectric layer stacked on a fully reflective gold ground. And the electric or magnetic resonances result in the incident plane waves at different frequencies to be effectively absorbed by the BDS film, which leads to the high absorption at 1.56 THz, 3.28 THz, and 3.95 THz resonant frequencies. The tunability of the resonant frequencies depends on various Fermi levels. Moreover, the physical mechanisms of the absorber with good stability over wide incident angles and polarization insensitivity are expounded. The proposed BDS-based absorber has great potentials in sensors, thermal emitters, and energy harvesting, etc.
Highlights
T ERAHERTZ (THz) technology has many potential prospects both in scientific research and practical applications, such as spectrum detection of material properties, non-destructive detection, biological sensing, medical diagnosis, security screening and high-speed wireless communication, etc. [1]–[5]
Wang et al proposed tunable absorbers with square-shaped, circular-patch, and cross-shaped resonators based on 200 nm bulk Dirac semimetals (BDSs) film [31]
We propose a tunable triple-band metasurface absorber based on BDS in terahertz regime
Summary
T ERAHERTZ (THz) technology has many potential prospects both in scientific research and practical applications, such as spectrum detection of material properties, non-destructive detection, biological sensing, medical diagnosis, security screening and high-speed wireless communication, etc. [1]–[5]. These metamaterial-based TAs were characterized in terms of single band absorption, which greatly hampered their practical application. Wang et al proposed tunable absorbers with square-shaped, circular-patch, and cross-shaped resonators based on 200 nm BDS film [31]. They combined two BDS resonators into one-unit cell to achieve dual bands and wide band THz absorber. We proposed a single narrowband absorber with metasurface structure [32] This absorber consisted of a 20nm BDS film patterned with a ring slot array, dielectric layer, and gold mirror, which can operate dynamically in the frequency range of 1.5 THz∼ 2.75 THz with the absorption ≥ 90%. This design has characters including ultrathin, insensitivity to polarizations and wide incident angles of electromagnetic waves
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