Investigation of multiband plasmonic metamaterial perfect absorbers based on graphene ribbons by the phase-coupled method
Investigation of multiband plasmonic metamaterial perfect absorbers based on graphene ribbons by the phase-coupled method
复制标题
相位耦合法研究基于石墨烯带的多带等离子体超材料完美吸收体
DOI：
10.1016/j.carbon.2018.10.002
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发表时间：
2019-01-01
期刊：
影响因子：
10.9
通讯作者：
Wang, Lingling
中科院分区：
文献类型：
--
作者：
Li, Hongju;Ji, Chuansheng;Wang, Lingling
我们开发了一种新颖的相位耦合方法，以实现基于空间分离的石墨烯带阵列与中红外等离子体共振的多光谱超材料近单位吸收器。从耦合模理论和时域有限差分模拟的结果表明，除了由双层相同的带阵列实现的单频带吸收，观察到突出的双频带完美吸收与仅通过改变间隔物厚度的双层带之间的相位的变化。吸收峰的光谱位置可以通过石墨烯的带宽和化学势的微小变化来方便地调节。此外，三频吸收器通过相同的原理容易地实现，并且这种吸收器对于法线入射角是鲁棒的。传输矩阵方法还用于进一步揭示相位耦合诱导多光谱吸收体的底层物理特性。理论分析与数值计算结果吻合良好。因此，相位耦合方法为获得多通道超材料理想吸收体提供了新的机会。(C)2018爱思唯尔有限公司版权所有
We develop an original phase-coupled method to realize multispectral metamaterial near-unity absorbers based on spatially separated graphene ribbon arrays with mid-infrared plasmonic resonances. The results both from the coupled-mode theory and finite-difference time-domain simulations reveal that in addition to the single-band absorption enabled by the bi-layer identical ribbon arrays, the outstanding dual-band perfect absorption is observed with the change in the phase between bi-layer ribbons only by varying the spacer thickness. The spectral positions of absorption peaks are tuned handily by small changes in ribbon widths and chemical potentials of graphene. Moreover, the tripleband absorber is achieved handily by the same principle and such absorbers are robust for nornormal incident angles. The transfer matrix method is also utilized to uncover further the underlying physics of the phased-coupled-induced multispectral absorbers. Theoretical analysis are in excellent agreement with numerical calculations. The phase-coupled method thus provides new opportunities for obtaining multi-channel metamaterial perfect absorbers. (C) 2018 Elsevier Ltd. All rights reserved.