Preprint article ยท Journal article
Probing nonlocal effects in metals with graphene plasmons
University of Minho1
Barcelona Institute of Science and Technology2
Center for Nanostructured Graphene, Centers, Technical University of Denmark3
Department of Photonics Engineering, Technical University of Denmark4
Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark5
Shahid Chamran University of Ahvaz6
Department of Micro- and Nanotechnology, Technical University of Denmark7
Theoretical Nanotechnology, Department of Micro- and Nanotechnology, Technical University of Denmark8
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 nanostructured into a periodic grating, we show that the resulting 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 may lead to smaller losses for the graphene plasmons than what is predicted by a local calculation. Finally, we demonstrate that such nonlocal effects can be very well mimicked using a local theory with an effective spacer thickness larger than its actual value.
Language: | English |
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Year: | 2018 |
Pages: | 16 |
ISSN: | 1550235x , 10980121 , 24699969 and 24699950 |
Types: | Preprint article and Journal article |
DOI: | 10.1103/PhysRevB.97.245405 |
ORCIDs: | Goncalves, P. A. D. , Jauho, Antti-Pekka and Mortensen, N. Asger |