期刊
NATURE NANOTECHNOLOGY
卷 7, 期 3, 页码 161-165出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2011.252
关键词
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资金
- National Science Foundation [DMR-0938330]
- Oak Ridge National Laboratory (ORNL)
- Office of Basic Energy Sciences, US Department of Energy (DOE)
- Office of Basic Energy Sciences, Materials Sciences and Engineering Division, US DOE
- DOE [DE-FG02-09ER46554]
- McMinn Endowment at Vanderbilt University
- Office of Science of the US DOE [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0938330] Funding Source: National Science Foundation
Plasmons in graphene(1-4) can be tuned by using electrostatic gating or chemical doping(5-7), and the ability to confine plasmons in very small regions could have applications in optoelectronics(8,9), plasmonics(10,11) and transformation optics(12). However, little is known about how atomic-scale defects influence the plasmonic properties of graphene. Moreover, the smallest localized plasmon resonance observed in any material to date has been limited to around 10 nm (refs 13-15). Here, we show that surface plasmon resonances in graphene can be enhanced locally at the atomic scale. Using electron energy-loss spectrum imaging in an aberration-corrected scanning transmission electron microscope, we find that a single point defect can act as an atomic antenna in the petahertz (10(15) Hz) frequency range, leading to surface plasmon resonances at the subnanometre scale.
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