Decay of orientational grating of weakly confined excitons in GaAs thin films

O. Kojima, T. Isu, Junko Hayase, A. Kanno, R. Katouf, M. Sasaki, M. Tsuchiya

Research output: Contribution to journalArticle

Abstract

We report the dynamical properties of the exciton orientation in GaAs thin films using the orientational grating (OG) technique. From the results of excitation-power dependence of OG signal, we confirmed that the OG signal comes from the optical nonlinearity of weakly confined excitons. In addition, the OG-decay time decreases with an increase of excitation power due to exciton-exciton interaction, and the shortest decay time is below 1 ps. Our results may imply the potential application of optical nonlinearity of weakly confined exciton to ultrafast switching devices operating at 1 Tbit/s.

Original languageEnglish
Pages (from-to)963-965
Number of pages3
JournalJournal of Luminescence
Volume128
Issue number5-6
DOIs
Publication statusPublished - 2008 May
Externally publishedYes

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excitons
gratings
Thin films
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thin films
nonlinearity
excitation
gallium arsenide
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Keywords

  • Nonlocal response
  • Optical nonlinear response
  • Thin film
  • Transient grating
  • Weakly confined exciton

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Decay of orientational grating of weakly confined excitons in GaAs thin films. / Kojima, O.; Isu, T.; Hayase, Junko; Kanno, A.; Katouf, R.; Sasaki, M.; Tsuchiya, M.

In: Journal of Luminescence, Vol. 128, No. 5-6, 05.2008, p. 963-965.

Research output: Contribution to journalArticle

Kojima, O, Isu, T, Hayase, J, Kanno, A, Katouf, R, Sasaki, M & Tsuchiya, M 2008, 'Decay of orientational grating of weakly confined excitons in GaAs thin films', Journal of Luminescence, vol. 128, no. 5-6, pp. 963-965. https://doi.org/10.1016/j.jlumin.2007.11.040
Kojima, O. ; Isu, T. ; Hayase, Junko ; Kanno, A. ; Katouf, R. ; Sasaki, M. ; Tsuchiya, M. / Decay of orientational grating of weakly confined excitons in GaAs thin films. In: Journal of Luminescence. 2008 ; Vol. 128, No. 5-6. pp. 963-965.
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AU - Hayase, Junko

AU - Kanno, A.

AU - Katouf, R.

AU - Sasaki, M.

AU - Tsuchiya, M.

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AB - We report the dynamical properties of the exciton orientation in GaAs thin films using the orientational grating (OG) technique. From the results of excitation-power dependence of OG signal, we confirmed that the OG signal comes from the optical nonlinearity of weakly confined excitons. In addition, the OG-decay time decreases with an increase of excitation power due to exciton-exciton interaction, and the shortest decay time is below 1 ps. Our results may imply the potential application of optical nonlinearity of weakly confined exciton to ultrafast switching devices operating at 1 Tbit/s.

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KW - Optical nonlinear response

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