Abstract
The tunable terahertz (THz) Fano-resonant filter based on hybrid metal-graphene metamaterial was proposed. The optical parameters of metasurface with unit cell in the form of a cross-shaped graphene sheet in the center of a square gold ring were simulated by the finite element method using a surface conductivity model of a graphene monolayer. The narrowband modulation of the transmission by varying the Fermi level of the graphene and the position of graphene cross inside the metal ring was demonstrated. Simulation results were well explained theoretically using a three-coupled oscillator model. The proposed device can be used as a narrowband filter in wireless THz communication systems and sensing applications.
Highlights
The radiation in THz frequency range has recently turned into an active area of scientific research due to the creation of efficient THz sources and detectors [1]
The findings reveal the interaction between the graphene cross-shaped resonators and the surrounding metal ring, which opens a perspective towards the implementation of the proposed THz device for narrowband filtering and sensing applications
In order to understand the nature of the arising resonances, we simulated the electric field distribution of the graphene cross-shaped metasurface, the metal square ring metasurface, and the integrated one at two frequencies associated with resonant dips in the transmission spectrum
Summary
The radiation in THz (tunable terahertz) frequency range has recently turned into an active area of scientific research due to the creation of efficient THz sources and detectors [1]. The conductivity of graphene can be changed by applying a bias voltage between metamaterial and graphene, as well as by infrared optical pumping or chemical doping [9] The usage of such material in the structure of metamaterial allows one to achieve efficient and ultra-high-speed control of THz radiation. Different hybrid structures based on graphene/metal have been proposed in recent works [10,11] These devices have a low quality factor as they generally operate in a wide frequency band. Integrating tunable 2D material into static metamaterial with Fano resonance allows one to achieve the active modulation of Fano spectral curves These devices can filter the spectrum of transmission or reflection of THz radiation, cutting out or skipping any frequency components determined by the geometry of the metamaterial unit cell. The findings reveal the interaction between the graphene cross-shaped resonators and the surrounding metal ring, which opens a perspective towards the implementation of the proposed THz device for narrowband filtering and sensing applications
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