研究目的
To demonstrate a tunable THz dielectric metasurface constructed by split gap bars array, STO film, and graphene monolayer, achieving quasi-BIC Fano resonance with high Q-factor and strongly localized electric fields in gaps, and to independently tune both the amplitude and the resonance frequency of quasi-BIC Fano resonance by controlling Fermi level of graphene and temperature of the STO film, respectively.
研究成果
The study successfully demonstrates a tunable THz dielectric metasurface with independently tunable amplitude and resonance frequency of quasi-BIC Fano resonance. The transmission amplitude can be modulated from 16.17% to 66.08% with Fermi level shifting from 0 eV to 0.15 eV and the resonance frequency can be tuned from 0.6108 THz to 0.6458 THz with the temperature of the STO film changing from 270 K to 390 K. This opens a novel way for active control quasi-BIC Fano resonance metasurfaces that will design versatile devices such as modulators, filters, and biosensors.
研究不足
The study is theoretical and relies on simulations, which may not fully capture all real-world physical phenomena. Experimental validation is needed to confirm the findings.
1：Experimental Design and Method Selection:
The study employs electromagnetic full-wave simulation CST microwave studio for calculations with the frequency domain solver and tetrahedral mesh type. The unit cell boundary conditions were applied in x- and y-directions to characterize the periodic structure, and the open boundary condition was employed along the z-direction in the free space. The THz wave was a normal incidence with the electric field along the x-axis.
2：Sample Selection and Data Sources:
The proposed structure consists of graphene monolayer, STO film, and dielectric metasurfaces. The unit cell structure is composed of two rectangular bars with middle split gaps and different lengths L1 and L
3：List of Experimental Equipment and Materials:
The materials used include LiTaO3 as the dielectric bar, graphene monolayer, and strontium titanate (STO) film. The geometric parameters of the unit cell are specified.
4：Experimental Procedures and Operational Workflow:
The transmission spectrum of the proposed structure is investigated with varying parameters such as the Fermi level of graphene and the temperature of the STO film.
5：Data Analysis Methods:
The transmission spectra and the corresponding electric field distributions are simulated to investigate the modulation and interaction of graphene monolayer with the quasi-BIC Fano resonance.
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