Characteristics of coherent transverse optical phonon in CuI thin films on Au nano-films

  • Shota Isshiki
  • Yuuki Nagata
  • Goro Oohata
  • Akira Kawakami
  • Shingo Saito
  • Kohji Mizoguchi
Regular Article
Part of the following topical collections:
  1. Topical issue: Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials

Abstract

We have investigated the coherent phonon in CuI thin films deposited on Au films with nanoscale roughness. It is found that the coherent transverse optical (TO) phonon in the CuI thin film on the Au film is dramatically enhanced, whereas that in the CuI thin film without the Au film is hardly observed. The enhancement of the coherent TO phonon in the CuI thin film on the Au film will originate from the surface enhanced electric field around the surface of the Au film with nanoscale roughness. To clarify the properties of the enhanced coherent phonon, we have investigated the pump-power dependence and pump-polarization dependence of the coherent phonon. We discuss the generation process of the coherent phonon in the CuI thin film on the Au film as compared with the pump-power dependence and the pump-polarization dependence.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Shota Isshiki
    • 1
  • Yuuki Nagata
    • 1
  • Goro Oohata
    • 1
  • Akira Kawakami
    • 2
  • Shingo Saito
    • 2
  • Kohji Mizoguchi
    • 1
  1. 1.Department of Physical ScienceOsaka Prefecture UniversityOsakaJapan
  2. 2.National Institute of Information and Communications TechnologyOsakaJapan

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