TY - JOUR
T1 - Decay of orientational grating of weakly confined excitons in GaAs thin films
AU - Kojima, O.
AU - Isu, T.
AU - Ishi-Hayase, J.
AU - Kanno, A.
AU - Katouf, R.
AU - Sasaki, M.
AU - Tsuchiya, M.
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for the Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
PY - 2008/5
Y1 - 2008/5
N2 - 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.
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.
KW - Nonlocal response
KW - Optical nonlinear response
KW - Thin film
KW - Transient grating
KW - Weakly confined exciton
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U2 - 10.1016/j.jlumin.2007.11.040
DO - 10.1016/j.jlumin.2007.11.040
M3 - Article
AN - SCOPUS:40649124830
SN - 0022-2313
VL - 128
SP - 963
EP - 965
JO - Journal of Luminescence
JF - Journal of Luminescence
IS - 5-6
ER -