We report on an ultrafast nonlinear optical response of weakly confined excitons in GaAs thin films observed by a two-beam degenerate four-wave-mixing (DFWM) technique. An ultrafast optical response comparable to the pulse width appears under ultrashort-pulse-laser excitation condition. We clarified from the DFWM spectra that the plural exciton states contribute to the ultrafast response. The results imply a possibility of ultrafast switching devices using weakly confined excitons.
|ジャーナル||Physica Status Solidi (C) Current Topics in Solid State Physics|
|出版ステータス||Published - 2007 12 1|
|イベント||33rd International Symposium on Compound Semiconductors, ISCS-2006 - Vancouver, BC, Canada|
継続期間: 2006 8 13 → 2006 8 17
ASJC Scopus subject areas
- Condensed Matter Physics