Journal
NANO LETTERS
Volume 14, Issue 7, Pages 3876-3880Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501096s
Keywords
Graphene; boron nitride; plasmonics; strong coupling; phonon-induced transparency; surface phonon plasmon polariton; plasmon phonon hybridization
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Funding
- Air Force Office of Scientific Research under MURI [FA9550-12-1-0488, FA9550-12-1-0024]
- Global Frontier R&D Program on Center for Multiscale Energy Systems - National Research Foundation under the Ministry of Science, ITC & Future Planning, Korea [2011-0031561, 2011-0031577]
- POSCO TJ Park Foundation
- Resnick Sustainability Institute at Caltech
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Infrared transmission measurements reveal the hybridization of graphene plasmons and the phonons in a monolayer hexagonal boron nitride (h-BN) sheet. Frequency-wavevector dispersion relations of the electromagnetically coupled graphene plasmon/h-BN phonon modes are derived from measurement of nanoresonators with widths varying from 30 to 300 nm. It is shown that the graphene plasmon mode is split into two distinct optical modes that display an anticrossing behavior near the energy of the h-BN optical phonon at 1370 cm(-1). We explain this behavior as a classical electromagnetic strong-coupling with the highly confined near fields of the graphene plasmons allowing for hybridization with the phonons of the atomically thin h-BN layer to create two clearly separated new surface-phonon-plasmon-polariton (SPPP) modes.
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