Gated Tunability and Hybridization of Localized Plasmons in Nanostructured Graphene
Gated Tunability and Hybridization of Localized Plasmons in Nanostructured Graphene
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DOI：
10.1021/nn3055835
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发表时间：
2013-03-01
期刊：
影响因子：
17.1
通讯作者：
Javier Garcia de Abajo, F.
中科院分区：
文献类型：
--
作者：
Fang, Zheyu;Thongrattanasiri, Sukosin;Javier Garcia de Abajo, F.
由于其高电子迁移率和独特的掺杂能力，石墨烯已成为光电应用的杰出材料。在这里，我们展示了低至 3.7 μm 光波长的石墨烯纳米盘和纳米环中等离子体激元的电可调性和杂交。通过施加栅极电压对图案化石墨烯阵列进行电掺杂，我们观察到等离激元能量和强度的根本变化，这与严格的分析理论具有极好的定量一致性。我们进一步证明，随着能量的增加，等离子体寿命意外增加。适当选择纳米级尺寸的纳米环中的等离激元杂化和电掺杂是将石墨烯剂量器的光学响应带到近红外的关键要素，它可以为光调制、开关和传感提供强大的、可集成的平台。
Graphene has emerged as an outstanding material for optoelectronic applications due to its high electronic mobility and unique doping capabilities. Here we demonstrate electrical tunability and hybridization of plasmons in graphene nanodisks and nanorings down to 3.7 mu m light wavelength. By electrically doping patterned graphene arrays with an applied gate voltage, we observe radical changes in the plasmon energy and strength, in excellent quantitative agreement with rigorous analytical theory. We further show evidence of an unexpected increase in plasmon lifetime with growing energy. Plasmon hybridization and electrical doping in nanorings of suitably chosen nanoscale dimensions are key elements for bringing the optical response of graphene doser to the near-Infrared, where it can provide a robust, integrable platform for light modulation, switching, and sensing.