The multistability of cavity-polariton systems with lowered symmetry (e.g., in laterally strained microcavities) allows implementing a few picoseconds long switching from linear to almost circular polarization of the cavity transmission under a resonant linearly polarized optical pump with slowly changing intensity. This effect has been observed in a high-Q GaAs microcavity using spectrally narrow 70 ps long pump pulses.
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Gavrilov et al. (2013) studied this question.
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