Wideband tunable mid-infrared cross polarization converter using rectangle-shape perforated graphene.
Wideband tunable mid-infrared cross polarization converter using rectangle-shape perforated graphene.
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DOI：
10.1364/oe.24.016913
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发表时间：
2016-07
期刊：
影响因子：
3.8
通讯作者：
Chen-Yu Yang;Yi Luo;Jiaxin Guo;Yang Pu;De He;Yadong Jiang;Jimmy Xu;Zhijun Liu
中科院分区：
文献类型：
--
作者：
Chen-Yu Yang;Yi Luo;Jiaxin Guo;Yang Pu;De He;Yadong Jiang;Jimmy Xu;Zhijun Liu
石墨烯的强等离子体响应和宽的静电可调谐性使其成为开发红外光电器件的一种很有前途的材料。本文提出了一种使用周期性穿孔石墨烯的中红外宽带可调交叉偏振转换器。偏振转换器由金属接地层、绝缘层和矩形周期性穿孔石墨烯片组成。该偏振转换器通过叠加两个局域表面等离子体激元模，在中心频率（46.8THz）的5%带宽内将线偏振转换为交叉偏振，峰值转换比超过90%。偏振转换性能在高达50°的入射角的宽范围内保持，并且通过石墨烯费米能量的静电调谐而高度可调。我们提出的器件能够操纵潜在的中红外应用的光偏振。
The strong plasmonic response and wide electrostatic tunability of graphene make it a promising material for developing infrared optoelectronic components. In this paper, we present a mid-infrared wideband tunable cross polarization converter using periodically perforated graphene. The polarization converter consists of a metal ground plane, an insulator layer, and a rectangle-shape periodically perforated graphene sheet. By superimposing two localized surface plasmon modes, the polarization converter transforms a linear polarization to its cross polarization over a bandwidth as wide as ~5% of the central frequency (46.8THz) with a peak conversion ratio exceeding 90%. The polarization conversion performance is maintained over a wide range of incident angles up to 50°, and is highly tunable by electrostatic tuning of the graphene Fermi energy. Our proposed device enables the manipulation of light polarization for potential mid-infrared applications.