Graphene Antidot Terahertz Plasmonic Metasurfaces Employing Self-Aligned Metal Cores for Sensing Applications
Graphene Antidot Terahertz Plasmonic Metasurfaces Employing Self-Aligned Metal Cores for Sensing Applications
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DOI：
10.1021/acsanm.9b01835
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发表时间：
2019-10
影响因子：
5.9
通讯作者：
Xianglong Miao;Geng Li;Licheng Xiao;P. Liu
中科院分区：
文献类型：
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作者：
Xianglong Miao;Geng Li;Licheng Xiao;P. Liu
石墨烯中的表面等离子体激元由于其对环境变化的极高灵敏度而具有巨大的分子传感应用潜力。在这里，我们展示了一种类型的混合石墨烯-金属超颖表面，它支持在太赫兹范围内的强石墨烯等离子体共振。这种混合超颖表面的每个单位单元由石墨烯反点组成，该石墨烯反点封闭使用自对准光刻工艺实现的金属盘。这种混合设计结合了石墨烯基和金属基光子结构的优点，导致相对于裸石墨烯反点超颖表面的近场强度增强2.3倍的可调谐等离子体共振和一个数量级的近场强度增强。
Surface plasmons in graphene have great potential for molecular sensing applications thanks to their exceedingly high sensitivity to environmental changes. Here, we demonstrate a type of hybrid graphene–metal metasurface that supports strong graphene plasmonic resonances in the terahertz range. Each unit cell of such a hybrid metasurface consists of a graphene antidot enclosing a metal disk realized using a self-aligned photolithography process. This hybrid design combines the advantages of both graphene- and metal-based photonic structures, leading to ∼3 times stronger tunable plasmonic resonances and an order of magnitude larger near-field intensity enhancement with respect to those of bare graphene antidot metasurfaces.