Propagation effects in spectrally resolved transient four wave mixing measurements on excitons in GaAs multiple quantum wells

✍ Scribed by Bipul Pal; A.S Vengurlekar; A.V Gopal; S.S Prabhu

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 319 KB
• Volume: 21
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(03)00385-0

✦ Synopsis

We perform spectrally resolved degenerate four wave mixing (DFWM) measurements by resonantly exciting 1s heavy hole excitons in 8 and 17:5 nm wide GaAs multiple quantum wells (MQW) with subpicosecond laser pulses. The signal is detected in a self-di raction mode in backward geometry. The DFWM spectra reveal a multiple peak structure, evolving into a double peak for positive delays. This may be related to the propagation e ects in MQWs due to strong photon-exciton coupling. The di erent peaks in the DFWM spectra show a dissimilar dependence on pulse excitation intensity, delay and polarization.