Angstrom-scale distance dependence of antenna-enhanced vibrational signals

• Verfasst von: Bochterle, Jörg [VerfasserIn]
• Verfasst von: Neubrech, Frank [VerfasserIn]
• Verfasst von: Pucci, Annemarie [VerfasserIn]
• Titel: Angstrom-scale distance dependence of antenna-enhanced vibrational signals
• Verf.angabe: Jörg Bochterle, Frank Neubrech, Tadaaki Nagao, and Annemarie Pucci
• Umfang: 7 S.
• Fussnoten: Gesehen am 10.10.2018
• Titel Quelle: Enthalten in: American Chemical Society: ACS nano
• Jahr Quelle: 2012
• Band/Heft Quelle: 6(2012), 12, S. 10917-10923
• ISSN Quelle: 1936-086X
• DOI: doi:10.1021/nn304341c
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1581731221

Abstract

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 (CO) 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 Å 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.