Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Coherent control of excitons in single and coupled quantum wells

Kazuhiro Komori, Takashi Asahara, Takeyoshi Sugaya, Masanobu Watanabe, Takehiko Hidaka

Published May 24, 1999• 0 citations
Publisher

Abstract

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.

DOI
10.1117/12.349291

Related papers

Ultrafast Coherent Control of Excitons Using Pulse-Shaping Technique

Kazuhiro Komori, Takeyoshi Sugaya, Masanobu Watanabe +1 more

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.

Japanese Journal of Applied Physics•Apr 1, 2000•14 citations

Ultrafast manipulation of coherent excitons using ultrashort-pulse sequences prepared by frequency domain shaping

Kazuhiro Komori, Takeyoshi Sugaya, Masanobu Watanabe

In this paper, we report ultrafast manipulation of coherent excitons in quantum-wells using phase locked pulse sequence prepared by a frequency domain shaping technique. The pulse shaping system with double liquid crystal spatial light modulator (SLM) and the Ti3+-sapphire laser are used to generate phase-locked pulses. Ultrafast coherent control of exciton population and exciton polarization is demonstrated by the observation of the reflectivity-change in the pump-probe and the diffracted power in the degenerate-four-wave-mixing measurements. In the single quantum wells, good coherent control characteristics with 87% of coherent carrier destruction is demonstrated at low excitation power of 0.15 mW (approximately 1.1 X 1010 photons/cm2). Also the preliminary manipulation of the exciton population is demonstrated by the phase locked multi-pulses. In case of coupled quantum-wells, the modulation of SLM is carefully controlled and coherent control of both the exciton population and the polarization are demonstrated in the two different coupled quantum well samples.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 28, 2000•0 citations

Fine phase control of coherent excitons using pulse shaping technique

Kazuhiro Komori, M. Watanabe, Takeyoshi Sugaya +2 more

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.

Conference on Lasers and Electro-Optics•Aug 29, 2005•0 citations

Ultrafast Coherent Control and Destruction of Excitons in Quantum Wells

Albert P. Heberle, Jeremy J. Baumberg, Klaus Köhler

We demonstrate the coherent destruction of photogenerated excitons in semiconductor quantum wells within a few hundred femtoseconds of their excitation. Coherent control of carrier dynamics is achieved with phase-locked pairs of 100 fs infrared pulses. The technique induces an optical response which is faster than the inverse of the exciton linewidth superseding Fourier limits for a single pulse. Energy selectivity enables the coherent transfer of angular momentum between hole states. Such phase-tailored pulse trains can be utilized to investigate the generation process and intermediate virtual states in quantum structures.

Physical Review Letters•Sep 25, 1995•404 citations

Coherent control of excitons in quantum wells using pulse-shaping techniques

Kazuhiro Komori, T. Asahara, Takeyoshi Sugaya +2 more

Coherent control of excitons in semiconductors require a sophisticated control method namely the pulse shaping technique. In this paper, we report the manipulation of coherent excitons in single and coupled quantum well structure using phase-locked femtosecond pulses generated by a pulse shaping technique.

IEEE Lasers and Electro-Optics Society Annual Meeting (LEOS)•Nov 27, 2002•0 citations

Real-time observation of the coherent control of linear- and four-wave-mixing polarization of excitons in a ZnSe single quantum well

T. Voss, Hans-Georg Breunig, Ilja Rückmann +1 more

The coherent control of excitonic and biexcitonic polarization in pulse-transmission and four-wave-mixing (FWM) experiments is analysed with real time resolution. As a model system a ZnSe single quantum well is exclusively excited at the heavy-hole exciton and exciton–biexciton resonance. In pulse-transmission experiments the coherent control of excitonic polarization is shown for low excitation intensities. At elevated excitation intensities the dephasing time of the polarization is found to be strongly dependent on the relative phase of two phase-locked laser pulses which perform the coherent manipulation of the polarization. In FWM experiments the separate coherent control of the excitonic and biexcitonic FWM polarization is demonstrated which enables a coherent manipulation of the amplitude and phase of exciton–biexciton beats which are observed on the FWM polarization transients.

Semiconductor Science and Technology•Mar 3, 2004•0 citations
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.
In this paper, we report ultrafast manipulation of coherent excitons in quantum-wells using phase locked pulse sequence prepared by a frequency domain shaping technique. The pulse shaping system with double liquid crystal spatial light modulator (SLM) and the Ti3+-sapphire laser are used to generate phase-locked pulses. Ultrafast coherent control of exciton population and exciton polarization is demonstrated by the observation of the reflectivity-change in the pump-probe and the diffracted power in the degenerate-four-wave-mixing measurements. In the single quantum wells, good coherent control characteristics with 87% of coherent carrier destruction is demonstrated at low excitation power of 0.15 mW (approximately 1.1 X 1010 photons/cm2). Also the preliminary manipulation of the exciton population is demonstrated by the phase locked multi-pulses. In case of coupled quantum-wells, the modulation of SLM is carefully controlled and coherent control of both the exciton population and the polarization are demonstrated in the two different coupled quantum well samples.
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.
We demonstrate the coherent destruction of photogenerated excitons in semiconductor quantum wells within a few hundred femtoseconds of their excitation. Coherent control of carrier dynamics is achieved with phase-locked pairs of 100 fs infrared pulses. The technique induces an optical response which is faster than the inverse of the exciton linewidth superseding Fourier limits for a single pulse. Energy selectivity enables the coherent transfer of angular momentum between hole states. Such phase-tailored pulse trains can be utilized to investigate the generation process and intermediate virtual states in quantum structures.
The coherent control of excitonic and biexcitonic polarization in pulse-transmission and four-wave-mixing (FWM) experiments is analysed with real time resolution. As a model system a ZnSe single quantum well is exclusively excited at the heavy-hole exciton and exciton–biexciton resonance. In pulse-transmission experiments the coherent control of excitonic polarization is shown for low excitation intensities. At elevated excitation intensities the dephasing time of the polarization is found to be strongly dependent on the relative phase of two phase-locked laser pulses which perform the coherent manipulation of the polarization. In FWM experiments the separate coherent control of the excitonic and biexcitonic FWM polarization is demonstrated which enables a coherent manipulation of the amplitude and phase of exciton–biexciton beats which are observed on the FWM polarization transients.