Enhanced graphene nonlinear response through geometrical plasmon focusing

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Document typeArticle
Defense date2018-01-01
PublisherAIP
Rights accessOpen Access
Abstract
We propose a simple approach to couple light into graphene plasmons and focus these excitations at
focal spots of a size determined by the plasmon wavelength, thus producing high optical field
enhancement that boosts the nonlinear response of the material. More precisely, we consider a
graphene structure in which incident light is coupled to its plasmons at the carbon edges and
subsequently focused on a spot of size comparable to the plasmon wavelength. We observe large
confinement of graphene plasmons, materializing in small, intense focal spots, in which the
extraordinary nonlinear response of this material leads to relatively intense harmonic generation.
This result shows the potential of plasmon focusing in suitably edged graphene structures to produce
large field confinement and nonlinear response without involving elaborated nanostructuring.
CitationSaavedra, J. R. M.; García de Abajo, F. J. Enhanced graphene nonlinear response through geometrical plasmon focusing. "Applied Physics Letters", 1 Gener 2018, vol. 112, núm. 061107.
ISSN0003-6951
Publisher versionhttps://aip.scitation.org/doi/abs/10.1063/1.5017120
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