The plasmon-induced transparency(PIT)is caused by the destructive interference between the e-lectromagnetic bright and dark modes.In this paper,we theoretically propose two simple and intuitive con-figurations of single-layer borophene metamaterials,and numerical simulations based on the finite-difference time-domain method show that they exhibit significant anisotropic PIT features in the optical communication band(～1 550 nm).By utilizing the near-field coupling of different crystal-oriented bright and dark modes,these configurations not only achieve anisotropic optical dispersion characteristics but also have the advan-tage of higher integration.Furthermore,by modulating the carrier density of borophene,active tuning of the transparent window spectrum position is achieved.In addition,by combining the theory of the coupled oscil-lator model and the A-type atomic three-level model,we qualitatively describe the optical interference paths in such anisotropic plasmon-induced transparency metamaterials and quantitatively characterize the evolution process of the transparent window with the coupling distance.The research results will provide a scientific basis for designing high-performance slow light devices in the near-infrared band.
关键词
硼烯/各向异性/等离激元诱导透明/时域有限差分方法/主动可调谐性/谐振子理论
Key words
borophene/anisotropy/plasmon-induced transparency/finite-difference time-domain method/active tuning/coupled oscillator model
维普
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