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Journal of the Korean Physical Society

Femtosecond Coherent Control of Absorption and Free Induction Decay in a GaAs Multiple Quantum Well

Dae-Su Yee, D. S. Kim

Published Nov 1, 2000• 0 citations
Publisher

Abstract

Excitonic polarizations are coherently excited using two phase-locked pulses. By probing the linear propagation of the pulses through a GaAs/AlGaAs multiple quantum well sample, we directly demonstrate the intriguing interaction between the coherent exciton polarizations and the controlling pulses. It is shown that the second pulse can be either strongly amplified by taking up energy gained from the destruction of the exciton polarization or drastically decreased by giving up all its energy to excitons. The temporal signatures of the transmitted pulse shapes agree well with model calculations.

DOI
10.3938/jkps.37.720

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Excitonic polarizations are coherently excited using two phase-locked pulses. By probing the linear propagation of the pulses through a GaAs/AlGaAs multiple quantum well sample, we directly demonstrate the intriguing interaction between the coherent exciton polarizations and the controlling pulses. It is shown that the second pulse can be either strongly amplified by taking up energy gained from the destruction of the exciton polarization or drastically decreased by giving up all its energy to excitons. The temporal signatures of the transmitted pulse shapes agree well with model calculations.
Summary form only given. 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 up conversion 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 (thus destroying the exciton population) or giving all of its energy to the system (thus greatly increasing the exciton population) respectively.
Dipole-forbidden transitions have been investigated by means of coherent control techniques. The 2p heavy-hole excitonic transition of a GaAs/AlGaAs multiple quantum well system was excited by a pair of phase-locked pulses with their energy at half the transition energy. The temporal evolution of the amplitude of coherent control, monitored in the secondary emission at the 1s heavy-hole exciton energy, showed two different contributions: one at the frequency of the optical field, and a second one at twice that frequency, from the interference of the excitonic polarisation. The latter component contains, besides the energy of the dark transition, information about the dynamics of the state.
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.
In this paper, we report the manipulation of coherent exciton in single- and coupled-quantum-wells using phase locked pulses generated by pulse shaping techniques instead of Michelson interferometer. The pulse shaping system with double liquid crystal spatial light modulator, and the Ti3+-sapphire laser with pulse width of about 120 fs are used to generate phase-locked pulses. GaAs/AlGaAs quantum-wells (exciton energy: E0 equals 1.5470 eV) and asymmetric double coupled quantum-well structures (exciton energy: E1 equals 1.5348 eV, E2 equals 1.5422 eV) are used in the experiments. Manipulation of coherent exciton are demonstrated by observation of both the reflectivity-change in the pump-probe and the diffracted power in the degenerate-four-wave-mixing (DFWM) measurements using phase- locked twin-pulse (k1) and single-pulse (k2). Coherent destruction in single quantum-well is observed by the rapid decrease of reflectivity-change after the arrival of the second pulse (pulse interval: 500 fs) and good coherent control with 87% of coherent carrier destruction is demonstrated at low excitation power of 0.15 mW. In case of coupled quantum-wells, the modulation of SLM is carefully set to the twin-pulse having the spectrum with a minimum at both exciton wavelengths for destructive condition. After arrival of the second pulse, coherent control of the quantum beats are observed in DFWM signal.
In this paper, we report on the ultrafast coherent control of excitons in quantum wells using a phase-locked pulse sequence generated by pulse-shaping techniques. The pulse-shaping system with a double liquid-crystal spatial light modulator (SLM), and a Ti3+-sapphire laser is used to generate phase-locked pulses. The ultrafast coherent control of the exciton population and polarization is demonstrated by the observation of the reflectivity change in the pump-probe and the diffracted power in the degenerate-four-wave-mixing (DFWM) measurements. In single quantum wells, good coherent control characteristics with 87% coherent carrier destruction are demonstrated at the low excitation power of 0.15 mW (∼1.1×1010 photons/cm2). In addition, the preliminary manipulation of the exciton population is demonstrated by the phase-locked triple pulses. In the case of coupled quantum wells, the modulation of the SLM is carefully controlled and the coherent control of both the exciton population and the polarization is demonstrated in the two different coupled quantum-well samples.