Abstract
Graphene is a promising platform for configurable terahertz (THz) devices due to its reconfigurability, but most researches focus on its electrical tunability. Here, we propose a graphene-based THz metasurface comprised of graphene cut-wire arrays for magnetic manipulation of the THz wave. With the external magnetostatic field applied, the resonant currents of the graphene cut-wire can be effectively affected by the Lorentz force, leading to an evident tuning of the response of the metasurface. The simulated results fully demonstrate that the resonance frequencies of the graphene THz metasurface can be efficiently modulated under a vertical magnetostatic field bias, resulting in the manipulation of the transmittance and phase of the THz wave. As a new method of the tunable THz metasurface, our structure shows promising applications in the THz regime, including the ultracompact THz modulators and magnetic field sensors.
Highlights
The terahertz (THz) band lies in the frequency gap between the infrared and microwaves and possesses the characteristics of both photonics and electronics [1], making the THz wave of great perspective in material characterization [2], biomedical sciences [3], and wireless communication [4,5,6,7]
We suggest a magneto-controlled method to manipulate the transmittance properties of the incident THz wave, and proposed a graphene-based THz metasurface comprised of graphene cut-wire arrays for proof-of-principle demonstration
The effect of frequency modulation is mainly represented by the frequency modulation index [37], here we show the connection of the frequency modulation index and the applied external magnetostatic field
Summary
The terahertz (THz) band lies in the frequency gap between the infrared and microwaves and possesses the characteristics of both photonics and electronics [1], making the THz wave of great perspective in material characterization [2], biomedical sciences [3], and wireless communication [4,5,6,7]. In the development of THz technology, effective manipulation of THz waves is important, which still remains challenging in practical application. Metamaterials are composed of periodic or aperiodic subwavelength scale artificial unit structures, exhibiting extraordinary electromagnetic properties [8,9,10,11,12]. The electromagnetic response of the incident waves can be flexibly customized to satisfy the application needs [13]. As a two-dimensional metamaterial, metasurfaces have been widely applied in THz modulators, switchers, phase shifters, and sensors [14,15,16,17] due to their advantages of ultrathin and easy to implement
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