All-optical generation of surface plasmons in graphene
By Thomas J. Constant, S. M. Hornett, Darrick E. Chang, E. Hendry. Nature Physics, 2015
202 citations recorded by the source corpus.
The strong confinement of plasmons in graphene makes them interesting for practical applications, but also difficult to excite. An all-optical technique can excite plasmons in graphene over a range of frequencies. Surface plasmons in graphene offer a compelling route to many useful photonic technologies1,2,3. As a plasmonic material, graphene offers several intriguing properties, such as excellent electro-optic tunability4, crystalline stability, large optical nonlinearities5 and extremely high electromagnetic field concentration6. As such, recent demonstrations of surface plasmon excitation in graphene using near-field scattering of infrared light7,8 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.
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/27a2c409f4674fc89a806d4cf0c07c972507d48d
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Citations in the corpus
- Polaritons in van der Waals materials (2016, background): “tures (110–112), (B) nonlinear wave mixing (95), (C) antenna-like nanotips”