All-optical generation of surface plasmons in graphene

被引：0
作者：
Constant T.J. [1 ]
Hornett S.M. [1 ]
Chang D.E. [2 ]
Hendry E. [1 ]
机构：
[1] Department of Physics, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, Devon
[2] ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, Castelldefels (Barcelona), Barcelona
来源：
Nature Physics | 2016年 / 12卷 / 2期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1038/nphys3545
中图分类号：
学科分类号：
摘要：
Surface plasmons in graphene offer a compelling route to many useful photonic technologies. As a plasmonic material, graphene offers several intriguing properties, such as excellent electro-optic tunability, crystalline stability, large optical nonlinearities and extremely high electromagnetic field concentration. As such, recent demonstrations of surface plasmon excitation in graphene using near-field scattering of infrared light have received intense interest. Here we present an all-optical plasmon coupling scheme which takes advantage of the intrinsic nonlinear optical response of graphene. Free-space, visible light pulses are used to generate surface plasmons in a planar graphene sheet using difference frequency wave mixing to match both the wavevector and energy of the surface wave. By carefully controlling the phase matching conditions, we show that one can excite surface plasmons with a defined wavevector and direction across a large frequency range, with an estimated photon efficiency in our experiments approaching 10 -5. © 2016 Macmillan Publishers Limited.
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页码：124 / 127
页数：3
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