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High frequency optical rectification in bulk GaAs and asymmetric AlGaAs/GaAs quantum wells

Hochfrequenz optische Gleichrichtung in homogenem GaAs und in asymetrischen AlGaAs/GaAs Quantenfilmen
: Graf, S.; Sigg, H.; Köhler, K.; Bächtold, W.

Gershoni, D.:
24th International Conference on the Physics of Semiconductors 1998. Proceedings
Singapore: World Scientific, 1999
ISBN: 981-02-3613-1
4 pp. : Ill., Lit.
International Conference on the Physics of Semiconductors <24, 1998, Jerusalem>
Conference Paper
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductor; quantum wells; Quantenfilm; optical measurement; optische Messung

The mechanism of the huge optical rectification (OR) in asymmetrical quantum wells (AQW) has been investigated at high frequencies (HF) obtained by short far infrared pulses generated by a free electron laser. The HF coupling into the fundamental mode of the traveling wave transmission line is tested using the bulk OR in GaAs. Whereas the observed signal clearly demonstrates the principle of our coupling concept, the corresponding signal in the AQW's at the intersubband resonance (ISR) could not he observed. A discussion of this unexpected result is given where we suggest investigations over the entire frequency range.