Angle-resolved polariton coherent dynamics in semiconductor microcavities

Summary form only given. In this work, we study the angle-resolved polariton coherent dynamics using time-integrated four-wave mixing (Ti-FWM). The experiment was achieved at 6 K on a 2-/spl lambda/ Cd/sub 0.4/Mg/sub 0.6/Te microcavity containing 6 CdTe quantum wells. The laser excitation was provided by 150-fs Ti:sapphire laser pulses. We performed self-diffracted degenerate Ti-FWM: two co-circularly polarized pulses, separated by a time delay /spl Delta//spl tau/, are incident on the sample in directions k/sub 1/ and k/sub 2/ close to an incident angle /spl theta/. The diffracted signal in the 2k/sub 2/-k/sub 1/ direction is detected in the reflection geometry. Incoming and out-coming beams are resonant with the same low-energy polariton state at /spl theta/, with negligible angular separation.