Ultra-multiband absorption enhancement of graphene in a metal-dielectric-graphene sandwich structure covering terahertz to mid-infrared regime
Ultra-multiband absorption enhancement of graphene in a metal-dielectric-graphene sandwich structure covering terahertz to mid-infrared regime
复制标题
覆盖太赫兹到中红外区域的金属-电介质-石墨烯夹层结构中石墨烯的超多波段吸收增强
DOI：
10.1364/oe.25.019185
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发表时间：
2017-08-07
期刊：
影响因子：
3.8
通讯作者：
Hou, Yumin
中科院分区：
文献类型：
--
作者：
Wang, Zongpeng;Hou, Yumin
我们研究了非结构化石墨烯片在从太赫兹（THz）到中红外波段的宽频率范围内的吸收增强。通过将石墨烯集成到金属-电介质-石墨烯（MDG）三明治结构中，观察到了超多带石墨烯对偏振波的吸收增强。多阶法布里-珀罗（FP）共振被证明是负责的多频带吸收。此外，通过在金属反射器上引入MDG结构来抑制传输通道，实现了理想的吸收。此外，通过改变石墨烯的掺杂水平，可以容易地调谐吸收峰。这项工作可能有潜力提高基于石墨烯的光电器件的性能，并可以被视为可调谐宽带近完美的超材料吸收体的演示。(C)2017美国光学学会
We investigate the absorption enhancement of an unstructured graphene sheet in a broad frequency range from terahertz (THz) to mid-infrared regime. Ultra-multiband graphene absorption enhancement is observed by integrating graphene in a metal-dielectric-graphene (MDG) sandwich structure for polarized waves. Multiple order Fabry-Perot (FP) resonances are demonstrated to be responsible for the multiband absorption. Furthermore, perfect absorption is realized by introducing the MDG structure on a metal reflector to suppress the transmission channel. In addition, the absorption peaks can be easily tuned by changing the doping level of graphene. This work may have potential for improving the performance of graphene based optoelectrical devices and can be regarded as a demonstration of a tunable broadband near-perfect metamaterial absorber. (C) 2017 Optical Society of America