Surface plasmon assisted photoemission from Au nanoparticles on graphite |
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Authors: | C Kennerknecht H Hövel M Merschdorf S Voll W Pfeiffer |
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Institution: | Physikalisches Institut, Universit?t Würzburg, 97?074 Würzburg, Germany, DE Universit?t Dortmund, Experimentelle Physik I, 44?221 Dortmund, Germany, DE
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Abstract: | The resonant multiple excitation of collective modes in metallic nanoparticles using ultrashort laser pulses leads to an enhanced
multiphoton photoemission from the particles. This effect is here demonstrated for the surface-plasmon resonance of Au nanoparticles
on graphite. The shape of the photoemission spectra is explained by multiphoton photo-assisted thermionic emission from the
nanoparticles and resonant emission via the image-potential state on graphite. Tuning the photon energy between 1.7 eV and
3.2 eV allows the identification of an enhancement of the photoemission yield at 2.1±0.1-eV photon energy that is attributed
to the resonant excitation of the surface plasmon in the Au nanoparticles. This identification of the surface-plasmon excitation
in this energy range is also supported by electron energy loss spectroscopy.
Received: 8 August 2001 / Revised version: 13 September 2001 / Published online: 10 October 2001 |
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Keywords: | PACS: 73 20 Mf 79 60 Jv 79 60 -i 79 20 Uv |
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