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Excitation of Soft Acoustic Mode by Stimulated Brillouim Scattering and Phase Transition Dynamics

Research Project

Project/Area Number 05452034
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionOsaka University

Principal Investigator

KINOSHITA Shuichi  Osaka University, Dept.Physics, Assistant Professor, 理学部, 助教授 (10112004)

Co-Investigator(Kenkyū-buntansha) YAGI Toshirou  Hokkaido University, Res.Inst.Electron.Sci., Professor, 電子科学研究所, 教授 (30002132)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1993: ¥3,700,000 (Direct Cost: ¥3,700,000)
KeywordsStimulates Brillouin scattering / Soft acoustic phonon / Phase transition dynamics / Debye model / Ferroelectricity / Soft mode / 非線形光学効果 / 強誘電性相転移 / 誘導ラマン散乱 / 光カー効果 / 液晶 / フォノン / 配向緩和 / TGSe
Research Abstract

the purpose of this research is to excite phonon in material directly by impulsive stimulated Brillouin scattering and to clarify the role of the phonon in phase transition phenomena. In the present work, we have done the following exeriment : 1) Measurement of quasi-longitudinal acoustic mode in TGSe (triglycine selenate) near the ferroelectric phase transition, 2) Development of femtosecond stimulated light scattering system, 3) Direct comparison of femtosecond optical Kerr effect spectroscopy with high resolution light scattering spectrum, 4) Experimental verification of the breakdown of Debye model.
1) TGSe is a crystal which undergoes ferroelectric phase transition at 22? A1C.Below the transition point, the anomaly in the velocity of the quasi-longitudinal phonon mode C_<33> has been found from the light scattering and ultrasonic experiments. This anomaly comes from the coupling of the phonon modes with the polarization fluctuation. Since the characteristic frequency of the polariz … More ation fluctuation is temperature-dependent, the velocity anomaly occurs at different temperatures dependent on the frequency of the phonon measured. In the present work, we have measured the temperature dependence of the phonon velocity in the intermediate frequency region (450 MHz) and have confirmed the proposed mechanism of this anomaly experimentally.
2) We have developed the femtosecond version of the stimulated light scattering. This system provides the excitation of THz phonon.
3) Optical Kerr effect spectroscopy and spontaneous light scattering in off-resonance excitation region are connected through fluctuation-dissipation theorem and we have confirmed this theorem experimentally by use of the high-resolution ligh scattering and femtosecond optical Kerr effect measurements.
4) Debye model has been often used to express the fluctuational behavior in phase transition studies. However, this model accompanies essential difficulty in itself such as breakdown of the momentum sum rule. Since the breakdown of this model is clearly observed in the time-domain by the finite initial rise in the response function, we have performed the experiment using typical liquids as samples. The response function obtained by the femtosecond optical Kerr effect and femtosecond polarization-selective four wave mixing experiment shows a clear initial rise in every sample. It is suggested that the breakdown of Debye model has serious effect when the fluctuation in a wide frequency range is discussed such as in glass transtions. Less

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 木下修一: "光パルスによるフォノンの励起と構造相転移" 個体物理. 28. 273-282 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita: "Relationship between coherent acoustic wave generation and a coherence spike in an impulsive stimulated Brillowin Scattering experiment" J.Opt.Soc.Am. B10. 1017-1024 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita: "New high-resolution phonon spectroscopy using impulsive stimulated Brillouin scattering" Rev.Sci.Instrum.64. 3384-3393 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita: "Extremely early stage of ferroelastic domain formation observed by laser refraction" Phys.Rev.B50. 5834-5837 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita: "Direct Comparison of femtosecond Fourier-transform Raman Spectrum with spontaneous light scattering spectrum" Chem.Phys.Lett.(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Kai: "Direct Comparison between femtosecond optical kerr and high-resolutionlight scattering measurements" J.Mol.Liq.(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita and T.Yagi: ""Phonon excitation by light pulse and structual phase transition"" Solid State Physics. 28. 273-282 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita, W.Tsurumaki, Y.Shimada and T.Yagi: ""Relationship between coherent acoustic wave generation and a coherence spike in an impulsive stimulated Brillouin scattering experiment"" J.Opt.Soc.Am.B10. 1017-1024 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita, Y.Shimada, W.Tsurumaki, M.Yamaguchi and T.Yagi: ""New high-resolution phonon spectroscopy using impulsive suimulated Brillouin scattering"" Rev.Sci.Instrum.64. 3384-3393 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita, S.Kutsuzawa.Y.Shimada and T.Yagi: ""Extremely early stage of ferroelastic domain formation observed by laser refraction"" Phys.Rev.B50. 5834-5837 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita, Y.Kai, M.Yamaguchi and T.Yagi: ""Direct comparison of femtosecond Fourier-transform Raman spectrum with spontaneous light scattering spectrum"" Chem.Phys.Lett.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Kai, S.Kinoshita, M.Yamaguchi and T.Yagi: ""Direct comparison between femtosecond optical Kerr and high-resolution lihgt scattering measerements"" J.Mol.Liq.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Kinoshita: "Extremely early stage of ferroelastic domain formation observed by laser refraction" Phys.Rev.B50. 5834-5837 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Kinoshita: "Direct Comparison of femtosecond Fourier-transform Raman spectrum with spontaneoas light scattering spectrum" Chem.Phys.Lett.(印刷中).

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Kai: "Direct Comparison between femtosecond optical Kerr and high-reso lution light scatteiing measurements" J.Mol.Lig.(印刷中).

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Kinoshita: "Relationship between coherent acoustic wave generation and a coherence spike in an impulsive stimulated Brillouin scattering Experiment" J.Opt.Soc.Am.B10. 1017-1024 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 木下修一: "光パルスによるフォノンの励起と構造相転移" 固体物理. 28. 273-282 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] S.Kinoshita: "New high-resolution phonon spectroscopy using impulsive stimulated Brillouin scattering" Rev.Sci.Instrum.64. 3384-3393 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2020-05-15  

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