Abstract
A plasmon-induced transparency (PIT) effect based on an asymmetric graphene loop structure has been proposed and investigated in this paper. The microstructure consists of a pair of graphene square loops and a dielectric substrate. The calculated results show that the transparency peak can be produced at 5.68 THz by the frequency detuning between two different graphene square loops. The geometric parameters of microstructure, such as the coincidence degree between two square loops, the length and the width of two square loops, will affect the position of PIT-window. Moreover, by adjusting the Fermi level of graphene through external gate voltage, the PIT-window can be dynamically tuned. Importantly, the PIT-window in graphene metamaterials can also serve as the amplitude modulator at the fixed frequency and the refractive index sensor. In addition, an improved microstructure is proposed for realizing the multi-PIT-window. The amplitude modulation of multi-PIT-window can be adjusted up to 53% by controlling the coupling distance, which has certain application prospects in the fields of double-channel filters, optical switches, and modulators.
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Funding
This work was supported by the National Natural Science Foundation of China under Grant 61875089, the National Natural Science Foundations of China under Grant 61705021 and the Kunshan and Nanjing University of Information Science and Technology (NUIST) intelligent sensor research center project.
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Ni, B., Tai, G., Ni, H. et al. Dynamically Tunable Terahertz Plasmon-Induced Transparency Analogy Based on Asymmetric Graphene Resonator Arrays. Plasmonics 17, 389–398 (2022). https://doi.org/10.1007/s11468-021-01530-6
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DOI: https://doi.org/10.1007/s11468-021-01530-6