Near-infrared spectroscopy of terahertz-driven semiconductor nanostructures

Junichiro Kono; Mark Y. Su; Kent B. Nordstrom; J. Cerne; Mark S. Sherwin; S. James Allen Jr.; Tohru Noda; T. Inoshita; Hiroyuki Sakaki

doi:10.1117/12.279378

16 October 1997 Near-infrared spectroscopy of terahertz-driven semiconductor nanostructures

Junichiro Kono, Mark Y. Su, Kent B. Nordstrom, J. Cerne, Mark S. Sherwin, S. James Allen Jr., Tohru Noda, T. Inoshita, Hiroyuki Sakaki

Author Affiliations +

Proceedings Volume 3153, Accelerator-Based Infrared Sources and Applications; (1997) https://doi.org/10.1117/12.279378
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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.

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Junichiro Kono, Mark Y. Su, Kent B. Nordstrom, J. Cerne, Mark S. Sherwin, S. James Allen Jr., Tohru Noda, T. Inoshita, and Hiroyuki Sakaki "Near-infrared spectroscopy of terahertz-driven semiconductor nanostructures", Proc. SPIE 3153, Accelerator-Based Infrared Sources and Applications, (16 October 1997); https://doi.org/10.1117/12.279378

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