Coherent exciton-photon dynamics in semiconductor microcavities: The influence of inhomogeneous broadening

We investigate a GaAs/(Ga,Al)As Fabry-Perot microcavity, into which (In,Ga)As quantum wells have been inserted. The cavity is wedge shaped, i.e., the detuning between the bare-exciton resonance and the bare optical cavity mode depends on the spatial position on the sample. Linear transmission spectra reveal a well-resolved Rabi splitting of 8 meV at resonance, an inhomogeneously broadened exciton transition of 4-5-meV width, and an 0.7-meV-wide Fabry-Perot mode. The time-resolved transmission exhibits deep beatings and a subpicosecond exponential decay: a behavior similar to that foreseen in the strong-coupling regime and in the absence of electronic disorder. Conversely, the four-wave mixing response appears weakly influenced by the cavity and not much different from what is expected for bare excitons. A photon echo, dephasing times as long as 50 ps, and only weak Rabi oscillations are observed. The experimentally observed features can be explained by a model based on the numerical solutions of the Maxwell-Bloch equations. This model confirms the dramatic influence structural disorder in the quantum wells has on the coherent nonlinear exciton-photon dynamics.


Published in:
Physical Review B, 55, 11, 7084-7090
Year:
1997
ISSN:
0163-1829
Keywords:
Note:
Univ cagliari,dipartimento sci fis,i-09124 cagliari,italy. ecole polytech fed lausanne,ph ecublens,inst phys appl,ch-1015 lausanne,switzerland. ecole polytech fed lausanne,ph ecublens,inst phys theor,ch-1015 lausanne,switzerland. ecole polytech fed lausanne,inst micro & optoelect,ph ecublens,ch-1015 lausanne,switzerland. Bongiovanni, G, UNIV CAGLIARI,IST NAZL FIS MAT,VIA OSPED 72,I-09124 CAGLIARI,ITALY.
ISI Document Delivery No.: WQ095
Times Cited: 35
Cited Reference Count: 32
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