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Proceedings Paper

Near-infrared spectroscopy of terahertz-driven semiconductor nanostructures
Author(s): Junichiro Kono; Mark Y. Su; Kent B. Nordstrom; J. Cerne; Mark S. Sherwin; S. James Allen Jr.; Tohru Noda; T. Inoshita; Hiroyuki Sakaki
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Paper Abstract

We have explored near-infrared (NIR)--far-infrared (FIR) two-color optical experiments in quantum-confined semiconductor systems, using NIR radiation from a tunable cw Ti:Sapphire laser and intense and coherent FIR radiation from the UCSB Free-Electron Lasers. In this paper two recent experiments are discussed, both of which provide new insight into the internal structure and dynamics of confined excitons: (1) We have observed for the first time FIR internal transitions associated with the direct exciton in GaAs/AlGaAs quantum wells. The spectrum of excitations is enriched by the complexities of the valence band and differ significantly from simple reduced-mass, hydrogenic models. We provide a critical test of detailed calculations including the valence-band mixing of Bauer and Ando. (2) We have discovered resonant nonlinear optical mixing of NIR and FIR radiation, which results in strong near-bandgap emission lines, or optical sidebands. The sidebands appear when optically-created excitons are driven strongly by intense FIR fields. The frequencies of the sidebands are (omega) NIR +/- 2n(omega) FIR, where (omega) NIR is the interband exciton-creation frequency, (omega) FIR is the frequency of the driving field, and n is an integer. The intensity of the sidebands exhibits pronounced resonances as a function of applied magnetic field, which are well- explained in terms of virtual transitions between magnetically-tuned energy levels in the excitons.

Paper Details

Date Published: 16 October 1997
PDF: 12 pages
Proc. SPIE 3153, Accelerator-Based Infrared Sources and Applications, (16 October 1997);
Show Author Affiliations
Junichiro Kono, Japan Science and Technology Corp. (Japan)
Univ. of California/Santa Barbara (United States)
Mark Y. Su, Univ. of California/Santa Barbara (United States)
Kent B. Nordstrom, Univ. of California/Santa Barbara (United States)
J. Cerne, Univ. of California/Santa Barbara (United States)
Mark S. Sherwin, Univ. of California/Santa Barbara (United States)
S. James Allen Jr., Univ. of California/Santa Barbara (United States)
Tohru Noda, Univ. of Tokyo (Japan)
T. Inoshita, Japan Science and Technology Corp. (Japan)
Hiroyuki Sakaki, Japan Science and Technology Corp. and Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 3153:
Accelerator-Based Infrared Sources and Applications
Gwyn P. Williams; Paul Dumas, Editor(s)

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