Terahertz optical mixing in biased GaAs single quantum wells

V. Ciulin, S. G. Carter, M. S. Sherwin, A. Huntington, and L. A. Coldren
Phys. Rev. B 70, 115312 – Published 20 September 2004

Abstract

The nonlinear mixing of near-infrared (NIR) and terahertz (THz) laser beams is investigated experimentally in a square GaAs quantum well structure, where the symmetry of the sample can be controlled by applying an electric field along the growth direction. The mixing produces sidebands, which appear at ωsideband=ωNIR+nωTHz, where n=±1,2,. For a given THz frequency, the intensity of the n=±1 sidebands displays two main resonances as a function of the NIR frequency. These resonances are separated by the THz frequency. Their intensity is found to depend strongly on the electric bias and on THz frequency. The n=±1 sideband intensity is zero when the sample is unbiased and increases significantly with bias. The sideband is strong when the THz laser frequency is tuned in resonance with an intersubband transition and also at low THz frequencies. The main features of our results are explained qualitatively, except at very high THz intensities, by a perturbative model of the nonlinear susceptibility χ(n+1). At high THz intensities, the resonances are observed to red shift and broaden.

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  • Received 23 February 2004

DOI:https://doi.org/10.1103/PhysRevB.70.115312

©2004 American Physical Society

Authors & Affiliations

V. Ciulin*, S. G. Carter, and M. S. Sherwin

  • iQUEST and Physics Department, University of California, Santa Barbara, California 93106, U.S.A

A. Huntington and L. A. Coldren

  • Materials Department, University of California, Santa Barbara, California 93106, U.S.A

  • *Present address: V. Birkedal née Ciulin, Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Århus C, Denmark.

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Vol. 70, Iss. 11 — 15 September 2004

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