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Dynamics of Coherent Optical Phonons in PbTiO3 Excited by Impulsive Stimulated Raman Scattering

  • K. G. Nakamura
  • H. Koguchi
  • J. Hu
  • H. Takahashi
  • M. Nakajima
  • S. Utsugi
  • H. Funakubo
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 125)

Abstract

Dynamics of coherent phonons in a ferroelectric film of PbTiO3 is investigated using femtosecond time-resolved transient reflection measurements with a pump and probe technique. Coherent optical phonons are generated by irradiation of a femtosecond laser pulse via impulsive stimulated Raman scattering. Four coherent oscillations with frequencies of 3.2, 4.7, 6.2 and 8.6 THz are observed and assigned to optical phonons of A1(1TO), A1(1LO), E(2TO), and \({\mathrm{B}}_{1} + \mathrm{E}\) modes, respectively. A positive frequency chirp is observed in the soft mode (A1(1TO)) within 2 ps, and explained by relaxation of vibrational states and anharmonicity of the potential curve in the soft mode coordinate.

Keywords

Wave Packet Continuous Wavelet Transformation Metal Organic Chemical Vapor Deposition Soft Mode Coherent Phonon 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • K. G. Nakamura
    • 1
    • 2
    • 3
  • H. Koguchi
    • 1
    • 2
  • J. Hu
    • 1
    • 2
    • 3
  • H. Takahashi
    • 1
    • 2
  • M. Nakajima
    • 2
  • S. Utsugi
    • 2
  • H. Funakubo
    • 2
  1. 1.Materials and Structure LaboratoryTokyo Institute of TechnologyYokohamaJapan
  2. 2.Department of Innovative Engineered MaterialsTokyo Institute of TechnologyYokohamaJapan
  3. 3.CREST, Japan Science and Technology AgencyKawaguchiJapan

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