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Low-energy acoustic plasmons at metal surfaces

Author

Listed:
  • Bogdan Diaconescu

    (University of New Hampshire, Durham, New Hampshire 03824, USA)

  • Karsten Pohl

    (University of New Hampshire, Durham, New Hampshire 03824, USA)

  • Luca Vattuone

    (Università di Genova, 16146 Genova, Italy)

  • Letizia Savio

    (Università di Genova, 16146 Genova, Italy)

  • Philip Hofmann

    (Institute for Storage Ring Facilities and Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, 8000 Aarhus C, Denmark)

  • Vyacheslav M. Silkin

    (Donostia International Physics Center (DIPC), Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain)

  • Jose M. Pitarke

    (CIC nanoGUNE Consolider and Materia Kondentsatuaren Fisika Saila, UPV/EHU, Mikeletegi Pasealekua 56, E-2009 Donostia, Basque Country, Spain)

  • Eugene V. Chulkov

    (Donostia International Physics Center (DIPC), Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain)

  • Pedro M. Echenique

    (Donostia International Physics Center (DIPC), Facultad de Ciencias Quimicas, UPV/EHU, 20018 San Sebastian, Spain)

  • Daniel Farías

    (Universidad Autónoma de Madrid, 28049 Madrid, Spain)

  • Mario Rocca

    (Università di Genova, 16146 Genova, Italy)

Abstract

The 'impossible' plasmon At the surface of a metal, collective electronic excitations such as surface plasmons are possible, and these can be exploited for a wide range of applications in microscopy and photonics. Now a new type of plasmon has been observed, one previously considered an impossibility on a metal surface. It has a much lower energy than the conventional type, so it was thought that it would be destroyed by the underlying bulk electrons in the metal. But this new plasmon, which has acoustic (or linear) dispersion, has an electronic structure that can coexist with the electron continuum of the bulk. The acoustic plasmon is likely to exist on many metal surfaces, and will be of particular relevance to nano-optics and photonics applications.

Suggested Citation

  • Bogdan Diaconescu & Karsten Pohl & Luca Vattuone & Letizia Savio & Philip Hofmann & Vyacheslav M. Silkin & Jose M. Pitarke & Eugene V. Chulkov & Pedro M. Echenique & Daniel Farías & Mario Rocca, 2007. "Low-energy acoustic plasmons at metal surfaces," Nature, Nature, vol. 448(7149), pages 57-59, July.
    • Handle: RePEc:nat:nature:v:448:y:2007:i:7149:d:10.1038_nature05975
    DOI: 10.1038/nature05975
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