Large-signal coherent control of normal modes in quantum-well semiconductor microcavity

Lee, Y.-S.; Norris, T. B.; Maslov, A.; Citrin, D. S.; Prineas, J.; Khitrova, G.; Gibbs, H. M.
June 2001
Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p3941
Academic Journal
We demonstrate coherent control of the cavity-polariton modes of a quantum-well semiconductor microcavity in a two-color scheme. The cavity enhancement of the excitonic nonlinearity gives rise to a large signal; modulating the relative phase of the excitation pulses between zero and π produces a differential reflectivity (ΔR/R) of up to 20%. The maximum nonlinear signal is obtained for cocircular pump and probe polarization. Excitation-induced dephasing is responsible for the incoherent nonlinear response, and limits the contrast ratio of the optical switching. © 2001 American Institute of Physics.


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