Ultraconfined Plasmonic Hotspots Inside Graphene Nanobubbles.
Nano Lett
; 16(12): 7842-7848, 2016 12 14.
Article
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| MEDLINE
| ID: mdl-27960518
ABSTRACT
We report on a nanoinfrared (IR) imaging study of ultraconfined plasmonic hotspots inside graphene nanobubbles formed in graphene/hexagonal boron nitride (hBN) heterostructures. The volume of these plasmonic hotspots is more than one-million-times smaller than what could be achieved by free-space IR photons, and their real-space distributions are controlled by the sizes and shapes of the nanobubbles. Theoretical analysis indicates that the observed plasmonic hotspots are formed due to a significant increase of the local plasmon wavelength in the nanobubble regions. Such an increase is attributed to the high sensitivity of graphene plasmons to its dielectric environment. Our work presents a novel scheme for plasmonic hotspot formation and sheds light on future applications of graphene nanobubbles for plasmon-enhanced IR spectroscopy.
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Banco de datos:
MEDLINE
Idioma:
En
Revista:
Nano Lett
Año:
2016
Tipo del documento:
Article
País de afiliación:
Estados Unidos