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|Title:||Probing nonlocal effects in metals with graphene plasmons|
|Author(s):||Dias, Eduardo J. C.|
Iranzo, David Alcaraz
Gonçalves, P. A. D.
Bludov, Yuliy V.
Mortensen, N. Asger
Koppens, Frank H. L.
Peres, N. M. R.
|Publisher:||American Physical Society (APS)|
|Journal:||Physical Review B - Condensed Matter and Materials Physics|
|Abstract(s):||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.|
|Appears in Collections:||CDF - CEP - Artigos/Papers (with refereeing)|