Trapping and Guiding Surface Plasmons in Curved Graphene Landscapes

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• 作者：Daria Smirnova ; S. Hossein Mousavi ; Zheng Wang ; Yuri S. Kivshar ; Alexander B. Khanikaev
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：3
• 期：5
• 页码：875-880
• 全文大小：524K
• 年卷期：0
• ISSN：2330-4022

文摘

We demonstrate that graphene placed on top of curved substrates offers a novel approach for trapping and guiding surface plasmons. Monolayer graphene with a spatially varying curvature exhibits an effective trapping potential for graphene plasmons near curved areas such as bumps, humps, and wells. We derive the governing equation for describing such localized channel plasmons guided by curved graphene and validate our theory by first-principle numerical simulations. The proposed confinement mechanism enables plasmon guiding by the regions of maximal curvature, and it offers a versatile platform for manipulating light in planar landscapes. In addition, isolated deformations of graphene such as bumps are shown to support localized surface modes and resonances, suggesting a new way to engineer graphene-based metasurfaces.