Direct observation of an ac Stark splitting in semiconductor microcavities excited above the continuum onset

QUOCHI, FRANCESCO;SABA, MICHELE;Ciuti C.;Stanley R. P.;Houdré R.;Oesterle U.;Staehli J. L.;Deveaud B.;BONGIOVANNI, GIOVANNI LUIGI CARLO;MURA, ANTONIO ANDREA

2000-01-01

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Abstract

We study the coherent optical response of a very high-finesse microcavity with a single quantum well by means of degenerate subpicosecond pump-probe spectroscopy. The dynamics of the ac Stark effect versus Pump intensity is investigated upon tuning the empty-cavity;mode-below and above the exciton transition energy, at the exciton continuum onset. The evolution from a simple dynamical excitonic shift to a dynamical splitting is clearly observed in both eases. The qualitative, agreement with numerical calculations based on the semiconductor Maxwell-Bloch equations is good.