期刊
NANOPHOTONICS
卷 9, 期 2, 页码 309-316出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2019-0323
关键词
graphene plasmonics; nonlocality; singular metasurfaces; singularities; plasmonics; local-analogue model
资金
- Centre for Doctoral Training on Theory and Simulation of Materials at Imperial College London - EPSRC [EP/L015579/1]
- Fundacao para a Ciencia e a Tecnologia and Instituto de Telecomunicacoes [CEECIND/03866/2017, UID/EEA/50008/2019]
- Gordon and Betty Moore Foundation
- VILLUM FONDEN [16498]
- University of Southern Denmark (SDU 2020 funding)
- Danish National Research Foundation [DNRF103]
Singular graphene metasurfaces, conductivity gratings realized by periodically suppressing the local doping level of a graphene sheet, were recently proposed to efficiently harvest THz light and couple it to surface plasmons over broad absorption bands, thereby achieving remarkably high field enhancement. However, the large momentum wavevectors thus attained are sensitive to the nonlocal behavior of the underlying electron liquid. Here, we extend the theory of singular graphene metasurfaces to account for the full nonlocal optical response of graphene and discuss the resulting impact on the plasmon resonance spectrum. Finally, we propose a simple local-analogue model that is able to reproduce the effect of nonlocality in local-response calculations by introducing a constant conductivity offset, which could prove a valuable tool in the modeling of more complex experimental graphene-based platforms.
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