Journal
ACS NANO
Volume 7, Issue 3, Pages 2388-2395Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn3055835
Keywords
plasmonics; graphene plasmons; nanophotonics; nanodisks; nanorings; optical tunability
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Funding
- Robert A. Welch Foundation [C-1220, C-1222]
- Office of Naval Research [N00014-10-1-0989]
- DoD NSSEFF [N00244-09-1-0067]
- Spanish MEC [MAT2010-14885]
- European Commission [FP7-ICT-2009-4-248909-LIMA]
- office of Naval Research through MURI program on graphene
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Graphene has emerged as an outstanding material for optoelectronic applications due to its high electronic mobility and unique doping capabilities. Here we demonstrate electrical tunability and hybridization of plasmons in graphene nanodisks and nanorings down to 3.7 mu m light wavelength. By electrically doping patterned graphene arrays with an applied gate voltage, we observe radical changes in the plasmon energy and strength, in excellent quantitative agreement with rigorous analytical theory. We further show evidence of an unexpected increase in plasmon lifetime with growing energy. Plasmon hybridization and electrical doping in nanorings of suitably chosen nanoscale dimensions are key elements for bringing the optical response of graphene doser to the near-Infrared, where it can provide a robust, integrable platform for light modulation, switching, and sensing.
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