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Quantum Electronics and Laser Science Conference

Self-pulse-shaping Coherent Control Of Excitons In A Semiconductor Microcavity

David S. Citrin

Published May 18, 1997• 0 citations
OpenAlex

Abstract

Heberle et al. demonstrated the use of phase-controlled optical pulse pairs to populate coherently and then to depopulate a quantum well (QW) with excitons on a 100-fs time-scale.1 In these experiments, one uses a pair of time-delayed identical pulses but with various relative phase shifts.

Related papers

Self-Pulse-Shaping Coherent Control of Excitons in a Semiconductor Microcavity

D. S. Citrin

The coherent control of the exciton population in quantum wells (QW's) is considered. For cavity-free QW's a $0\ensuremath{\pi}$ pulse leaves the QW empty of excitons subsequent to its passage. For the microcavity, in addition to certain $0\ensuremath{\pi}$ pulses, specially tailored pulses with nonzero area are also optimal. The coherent depopulation is a strong-coupling effect and is due to the $\ensuremath{\pi}$ phase shift in the self-consistent Maxwell field (i.e., including the local-field effect associated with the exciton resonance) in the cavity that occurs in the course of a vacuum-field Rabi flop.

Physical Review Letters•Nov 25, 1996•23 citations

Self-pulse-shaping Coherent Control Of Excitons In A Semiconductor Microcavity

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Summary form only given. Ultrafast coherent control of excitons in semiconductors have been reported using Michelson interferometer with precise control of the pulse interval in time domain. In order to improve the phase controllability and realize arbitrary manipulation, the pulse shaping technique is a more attractive candidate. In this paper, we report very fine phase control of coherent, excitons in GaAs/AlGaAs single quantum wells using phase-locked pulses prepared by pulse shaping technique.

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Coherent control of absorption and propagation in GaAs quantum wells; time and spectral domain studies

Dae-Su Yee, Ki‐Ju Yee, D.S. Kim

Recently, coherent control of exciton populations has been demonstrated through terahertz, reflection, and four-wave-mixing experiments. However, the most direct probe of exciton population control is the absorption, which has been lacking in previous studies. In this report, we probe the time evolution of exciton population directly through a transmission experiment. In particular, using upconversion technique with both narrow (spectrally broad) and broad (spectrally narrow) pulses, we can obtain both the temporal and the spectral information. The main thrust of our report is that when phase controlled, the second pulse can be either greatly enhanced or completely destroyed by gaining energy from exciton or giving all of its energy to the system, respectively.

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Coherent control and quantum correlations in quantum-well semiconductor microcavity

Y.-S. Lee, Theodore B. Norris, M. Kira +4 more

The normal modes in a nonperturbatively coupled quantum-well semiconductor microcavity are linear superpositions of the QW exciton and cavity mode when the QW exciton transition is resonant with the cavity mode. When the lower normal mode is excited by a phase-locked pair of optical pulses, the nonlinear response of a probe pulse tuned to the upper mode is controlled. Thus the normal modes are coupled in their nonlinear optical response due to the nonlinearity of the exciton underlying the two normal modes. The cavity enhancement of the excitonic nonlinearity gives rise to a large signal; modulating the relative phase of the excitation pulses produces a differential reflectivity of up to 10%. Besides the coherent control of normal modes which is explainable with in the frame of semiclassical models, we observe a purely quantum mechanical phenomenon in our system. The quantum correlations between the field and carrier density lead to intraband coherences which live much longer than the interband dephasing time.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 28, 2000•1 citation
The coherent control of the exciton population in quantum wells (QW's) is considered. For cavity-free QW's a $0\ensuremath{\pi}$ pulse leaves the QW empty of excitons subsequent to its passage. For the microcavity, in addition to certain $0\ensuremath{\pi}$ pulses, specially tailored pulses with nonzero area are also optimal. The coherent depopulation is a strong-coupling effect and is due to the $\ensuremath{\pi}$ phase shift in the self-consistent Maxwell field (i.e., including the local-field effect associated with the exciton resonance) in the cavity that occurs in the course of a vacuum-field Rabi flop.
Summary form only given. Ultrafast coherent control of excitons in semiconductors have been reported using Michelson interferometer with precise control of the pulse interval in time domain. In order to improve the phase controllability and realize arbitrary manipulation, the pulse shaping technique is a more attractive candidate. In this paper, we report very fine phase control of coherent, excitons in GaAs/AlGaAs single quantum wells using phase-locked pulses prepared by pulse shaping technique.
Recently, coherent control of exciton populations has been demonstrated through terahertz, reflection, and four-wave-mixing experiments. However, the most direct probe of exciton population control is the absorption, which has been lacking in previous studies. In this report, we probe the time evolution of exciton population directly through a transmission experiment. In particular, using upconversion technique with both narrow (spectrally broad) and broad (spectrally narrow) pulses, we can obtain both the temporal and the spectral information. The main thrust of our report is that when phase controlled, the second pulse can be either greatly enhanced or completely destroyed by gaining energy from exciton or giving all of its energy to the system, respectively.
The normal modes in a nonperturbatively coupled quantum-well semiconductor microcavity are linear superpositions of the QW exciton and cavity mode when the QW exciton transition is resonant with the cavity mode. When the lower normal mode is excited by a phase-locked pair of optical pulses, the nonlinear response of a probe pulse tuned to the upper mode is controlled. Thus the normal modes are coupled in their nonlinear optical response due to the nonlinearity of the exciton underlying the two normal modes. The cavity enhancement of the excitonic nonlinearity gives rise to a large signal; modulating the relative phase of the excitation pulses produces a differential reflectivity of up to 10%. Besides the coherent control of normal modes which is explainable with in the frame of semiclassical models, we observe a purely quantum mechanical phenomenon in our system. The quantum correlations between the field and carrier density lead to intraband coherences which live much longer than the interband dephasing time.