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首页> 外文期刊>Journal of Optics >Absorption enhancement of graphene Salisbury screen in the mid-infrared regime
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Absorption enhancement of graphene Salisbury screen in the mid-infrared regime

机译：中红外条件下石墨烯Salisbury荧光屏的吸收增强

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摘要

As an emerging optoelectronic material, graphene has exhibited negligible absorption in the mid-infrared due to its Drude-like behavior of free electrons. For this reason, existing graphene-based Salisbury screens with enhanced graphene absorption have been limited to terahertz frequencies, and are experiencing difficulty to extend to higher frequency region. We propose to utilize graphene interband conductivity instead of the commonly used intraband conductivity to realize graphene-based Salisbury screens in the mid-infrared. Distinct mid-infrared absorption features in graphene-based Salisbury screens are investigated numerically and analytically by means of transfer matrix method. In contrast to terahertz absorption arising from intraband transition, the enhanced absorption of graphene in the mid-infrared is dominated by the interband transition. For a single layer of graphene on top of a metallic plane, peak absorptions of 10 % are obtained at normal incidence, and nearly perfect absorptions close to 1 are achieved at near grazing angle for incident s-polarization. To further enhance the perfect absorption over wider incident angles, a graphene-dielectric multilayer stack is proposed and analyzed. These results are relevant to graphene optoelectronics for mid-infrared applications.
机译：作为新兴的光电材料，石墨烯由于其像德鲁德一样的自由电子行为而在中红外区的吸收可以忽略不计。因此，现有的具有增强的石墨烯吸收能力的基于石墨烯的Salisbury筛网仅限于太赫兹频率，并且难以扩展到更高的频率区域。我们建议利用石墨烯的带间电导率代替常用的带内电导率来实现基于石墨烯的中红外Salisbury屏幕。基于石墨烯的索尔兹伯里屏幕中不同的中红外吸收特征通过转移矩阵方法进行了数值和分析研究。与带内跃迁引起的太赫兹吸收相反，中红外中石墨烯吸收的增强主要由带间跃迁控制。对于在金属平面顶部的单层石墨烯，在法向入射时获得10％的峰值吸收，对于入射s极化，在接近掠射角时可获得接近1的几乎完美的吸收。为了进一步提高在较宽入射角上的理想吸收，提出并分析了石墨烯-电介质多层堆叠。这些结果与用于中红外应用的石墨烯光电相关。

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  • 来源
    《Journal of Optics》 |2015年第1期|59-67|共9页
  • 作者

    Xiangxiao Ying; Yang Pu; Zhe Li; Zhijun Liu; Yadong Jiang;

  • 作者单位

    School of Optoelectronic Information, University of Electronic Science and Technology of China, No. 4 Section 2 North Jianshe Road, Chengdu, Sichuan 610054, China;

    School of Optoelectronic Information, University of Electronic Science and Technology of China, No. 4 Section 2 North Jianshe Road, Chengdu, Sichuan 610054, China;

    School of Optoelectronic Information, University of Electronic Science and Technology of China, No. 4 Section 2 North Jianshe Road, Chengdu, Sichuan 610054, China;

    School of Optoelectronic Information, University of Electronic Science and Technology of China, No. 4 Section 2 North Jianshe Road, Chengdu, Sichuan 610054, China;

    School of Optoelectronic Information, University of Electronic Science and Technology of China, No. 4 Section 2 North Jianshe Road, Chengdu, Sichuan 610054, China;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Graphene; Salisbury screen; Optical absorption; Mid-infrared;

    机译：石墨烯索尔兹伯里屏幕;光吸收中红外;

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