Optical stark effect and coherent gain of excitons in a semiconductor microcavity
We report transient sub-picosecond pump and probe experiments performed on a semiconductor microcavity into which quantum wells have been inserted. The cavity is featuring resonance and strong coupling with the exciton. It is strongly and resonantly excited. Optical amplification of the probe beam (up to a factor of 5) appears, a blueshift of the polaritons occurs once the excitation reaches the exciton saturation density. The intensity of the probe, reflected or transmitted by the sample, oscillates while the pump to probe delay is varied. The frequency of the beats increases with pump intensity, and at the highest pumping rates it exceeds by far the frequency corresponding to the unperturbed Rabi splitting. This increase of the Rabi frequency is discussed in terms of the dynamical Stark shift of the excitons. while the amplification of the probe is qualitatively described as a coherent energy exchange between pump, excitons and probe.
WOS:000071319400007
1997
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Using Smart Source Parsing; 16 Dec. p; Ecole Polytech Fed Lausanne, PH Ecublens, Dept Phys, CH-1015 Lausanne, Switzerland. Univ Cagliari, Dipartimento Sci Fis, I-09124 Cagliari, Italy. Quochi, F, Ecole Polytech Fed Lausanne, PH Ecublens, Dept Phys, CH-1015 Lausanne, Switzerland. ISI Document Delivery No.: YP830 Times Cited: 1 Cited Reference Count: 9 Cited References: BONGIOVANNI G, 1997, PHYS REV B, V55, P7084 HOUDRE R, 1994, PHYS REV LETT, V73, P2043 MEYSTRE P, 1990, ELEMENTS QUANTUM OPT MYSYROWICZ A, 1986, PHYS REV LETT, V56, P2748 NORRIS TB, 1995, NUOVO CIMENTO D, V17, P1295 SAVONA V, 1997, PHYS REV LETT, V78, P4470 SCHMITTRINK S, 1986, PHYS REV LETT, V57, P2752 VONLEHMEN A, 1986, OPT LETT, V11, P609 WANG HL, 1995, PHYS REV B, V51, P14713
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