Spectrally resolved nonlinear optical response of weakly confined excitons under femtosecond laser pulse excitation in GaAs thin films

O. Kojima, T. Isu, Junko Hayase, M. Tsuchiya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)

Abstract

We have investigated the dynamical properties of the weakly confined excitons in GaAs thin films by a transient grating method (three-beam four-wave mixing) with the use of femtosecond-laser pulses. The time-domain signals under the exciton-excitation conditions show a nonlinear optical response with a rise time of 4 ps and a long decay time of 120 ps. Moreover, in the case of that the probe pulse is parallel polarized to the two excitation pulses, the ultrafast optical response comparable to the pulse width appears. These characteristics of the nonlinear optical response is different from the experimental results by the picosecond-laser-pulse excitation. The spectra of the transient grating signals at the various time delays show several peaks at the energies, which agree with the energies of excitons confined in the thin films. This fact demonstrates that the characteristics of the nonlinear optical response of the weakly confined excitons are drastically changed by the spectral width of the excitation laser-pulse.

Original languageEnglish
Title of host publicationPhysica Status Solidi C: Conferences
Pages675-678
Number of pages4
Volume3
Edition3
DOIs
Publication statusPublished - 2006
Externally publishedYes
Event32nd International Symposium on Compound Semiconductors, ISCS-2005 - Rust, Germany
Duration: 2005 Sep 182005 Sep 22

Other

Other32nd International Symposium on Compound Semiconductors, ISCS-2005
CountryGermany
CityRust
Period05/9/1805/9/22

Fingerprint

excitons
thin films
pulses
excitation
lasers
gratings
four-wave mixing
pulse duration
time lag
energy
probes
decay

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Spectrally resolved nonlinear optical response of weakly confined excitons under femtosecond laser pulse excitation in GaAs thin films. / Kojima, O.; Isu, T.; Hayase, Junko; Tsuchiya, M.

Physica Status Solidi C: Conferences. Vol. 3 3. ed. 2006. p. 675-678.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kojima, O, Isu, T, Hayase, J & Tsuchiya, M 2006, Spectrally resolved nonlinear optical response of weakly confined excitons under femtosecond laser pulse excitation in GaAs thin films. in Physica Status Solidi C: Conferences. 3 edn, vol. 3, pp. 675-678, 32nd International Symposium on Compound Semiconductors, ISCS-2005, Rust, Germany, 05/9/18. https://doi.org/10.1002/pssc.200564115
Kojima, O. ; Isu, T. ; Hayase, Junko ; Tsuchiya, M. / Spectrally resolved nonlinear optical response of weakly confined excitons under femtosecond laser pulse excitation in GaAs thin films. Physica Status Solidi C: Conferences. Vol. 3 3. ed. 2006. pp. 675-678
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