Gao Xiangfei, Zhu Zebin, Yuan Jing, Jiang Liyong
Opt Express. 2021 Apr 26;29(9):13314-13330. doi: 10.1364/OE.421413.
In the past few years, designing tunable and multifunctional terahertz devices has become a hot research area in terahertz science and technology. In this work, we report a study on one-dimensional anisotropic photonic crystals (1D APCs) containing graphene and phase-change material VO. We numerically demonstrate the band-pass filtering, perfect absorption, comb-shaped extraordinary optical transmission and Fano-like resonance phenomenon in pure 1D APCs and 1D APCs with a VO defect layer under different conditions of a tangential wave vector. The performance of these phenomena in the terahertz region can be modulated by changing the chemical potential of graphene. The band-pass filter and perfect absorber functions of 1D APCs with a VO defect layer can be freely switched by changing the phase of VO. We employ the equivalent-permittivity model and dispersion-relation equation to give reasonable explanations on these behaviors.
在过去几年中，设计可调谐和多功能太赫兹器件已成为太赫兹科学与技术领域的一个热门研究方向。在本工作中，我们报道了一项关于包含石墨烯和相变材料VO的一维各向异性光子晶体（1D APCs）的研究。我们通过数值模拟展示了纯1D APCs以及具有VO缺陷层的1D APCs在切向波矢不同条件下的带通滤波、完美吸收、梳状超常光传输和类法诺共振现象。在太赫兹频段，这些现象的性能可通过改变石墨烯的化学势进行调制。具有VO缺陷层的1D APCs的带通滤波器和完美吸收器功能可通过改变VO的相态自由切换。我们采用等效介电常数模型和色散关系方程对这些行为给出了合理的解释。
