Conference proceeding
Terahertz and optical frequency mixing in semiconductor quantum-wells
NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS, DEVICES, AND APPLICATIONS IX, Vol.7582(1), pp.75820Y-75820Y-8
Proceedings of SPIE
01/01/2010
DOI: 10.1117/12.841199
Abstract
The exciton binding energy in GaAs-based quantum-well (QW) structures is in the range of similar to 10 meV, which falls in the THz regime. We have conducted a time-resolved study to observe the resonant interactions of strong narrowband THz pulses with coherent excitons in QWs, where the THz radiation is tuned near the 1s-2p intraexciton transition and the THz pulse duration (similar to 3 ps) is comparable with the exciton dephasing time. The system of interest contains ten high-quality 12-nm-wide GaAs QWs separated by 16-nm-wide Al Ga-0.3 As-0.7 barriers. The strong and narrowband THz pulses were generated by two linearly-chirped and orthogonally-polarized optical pulses via type-II difference-frequency generation in a 1-mm ZnTe crystal. The peak amplitude of the THz fields reached similar to 10 kV/cm. The strong THz fields coupled the 1s and 2p exciton states, producing nonstationary dressed states. An ultrafast optical probe was employed to observe the time-evolution of the dressed states of the 1s exciton level. The experimental observations show clear signs of strong coupling between THz light and excitons and subsequent ultrafast dynamics of excitonic quantum coherence. As a consequence, we demonstrate frequency conversion between optical and THz pulses induced by nonlinear interactions of the THz pulses with excitons in semiconductor QWs.
Details
- Title: Subtitle
- Terahertz and optical frequency mixing in semiconductor quantum-wells
- Creators
- Yun-Shik Lee - Oregon State UniversityA. D. Jameson - Oregon State UniversityJ. L. Tomaino - Oregon State UniversityJ. P. Prineas - University of IowaJ. T. Steiner - PhilipsM. Kra - Philipps University of MarburgS. W. Koch - Philips
- Contributors
- P E Powers (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS, DEVICES, AND APPLICATIONS IX, Vol.7582(1), pp.75820Y-75820Y-8
- Publisher
- Spie-Int Soc Optical Engineering
- Series
- Proceedings of SPIE
- DOI
- 10.1117/12.841199
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Number of pages
- 8
- Grant note
- ONAMI DFG; German Research Foundation (DFG) 0449426 / NSF; National Science Foundation (NSF)
- Language
- English
- Date published
- 01/01/2010
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428783402771
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