Journal
ACS NANO
Volume 6, Issue 12, Pages 10917-10923Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn304341c
Keywords
local near-field; quantum plasmonics; gold antennas; cold-condensed carbon monoxide; SEIRS
Categories
Funding
- Deutsche Forschungsgemeinschaft [DFG Pu 193/9]
- Japanese Science Foundation
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics, MEXT, Japan
- Nanoantenna collaborative European project [HEALTH-F5-2009-241818]
- Heidelberg Graduate School of Fundamental Physics
- Grants-in-Aid for Scientific Research [20671002, 10F00501] Funding Source: KAKEN
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The resonantly enhanced near-field of micrometer-sized gold antennas has been probed with Angstrom-scale resolution. In situ surface-enhanced infrared spectroscopic vibrational signals of carbon monoxide ((0) layers cold-condensed on the antennas in ultrahigh-vacuum conditions are compared to the signals of CO layers with corresponding thicknesses on a flat gold surface. Vibrational signals of CO as well as the shift of the plasmonic resonance frequency were used to analyze the distance dependence of the near-field. The signal enhancement induced by the antennas not only decays monotonically from the surface but, in contrast to classical near-field models, shows a maximum between 10 and 15 angstrom and decays also toward the surface of the antenna. This effect is attributed to the spill-out of the electron wave function, as expected from quantum mechanical calculations.
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