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Journal Article

Two-photon photoemission from silver nanoparticles on thin alumina films: Role of plasmon excitation

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Evers,  Florian
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Rakete,  Christoph
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Watanabe,  Kazuo
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Menzel,  Dietrich
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Evers, F., Rakete, C., Watanabe, K., Menzel, D., & Freund, H.-J. (2005). Two-photon photoemission from silver nanoparticles on thin alumina films: Role of plasmon excitation. Surface Science, 593(1-3), 43-48. doi:10.1016/j.susc.2005.06.045.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-06FD-1
Abstract
Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al2O3 film on NiAl(1 1 0) has been investigated using femtosecond lasers. The 2PPE spectra show a feature similar to the surface state of Ag(1 1 1). The total 2PPE yield possesses a maximum at about 3.6 eV which corresponds to the surface plasmon resonance of the silver particles. For particle sizes of about 10 nm an enhancement by a factor 450 compared to Ag(1 1 1) is found. Up to this diameter the photoemission yield increases but levels off for larger sizes due to interactions between the particles. It is inferred that the 2PPE process is a direct transition via a virtual state, and that the enhanced 2PPE yield results from the enhancement of the electromagnetic field at the surface of nanoparticles.