Probing Nonlocal Effects in Metals with Graphene Plasmons

In this paper we analyze the effects of nonlocality on the optical properties of a system consisting of a thin metallic film separated from a graphene sheet by a hexagonal boron nitride (hBN) layer. We show that nonlocal effects in the metal have a strong impact on the spectrum of the surface plasmo...

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Veröffentlicht in:arXiv.org 2018-04
Hauptverfasser: Dias, Eduardo J C, David Alcaraz Iranzo, Gonçalves, P A D, Hajati, Yaser, Bludov, Yuliy V, Jauho, Antti-Pekka, Mortensen, N Asger, Koppens, Frank H L, Peres, N M R
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Sprache:eng
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Zusammenfassung:In this paper we analyze the effects of nonlocality on the optical properties of a system consisting of a thin metallic film separated from a graphene sheet by a hexagonal boron nitride (hBN) layer. We show that nonlocal effects in the metal have a strong impact on the spectrum of the surface plasmon-polaritons on graphene. If the graphene sheet is shaped into a grating, we show that the extinction curves can be used to shed light on the importance of nonlocal effects in metals. Therefore, graphene surface plasmons emerge as a tool for probing nonlocal effects in metallic nanostructures, including thin metallic films. As a byproduct of our study, we show that nonlocal effects lead to smaller losses for the graphene plasmons than what is predicted by a local calculation. We show that these effects can be very well mimicked using a local theory with an effective spacer thickness larger than its actual value.
ISSN:2331-8422
DOI:10.48550/arxiv.1804.06478