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Subterahertz superlattice parametric oscillator.

K F Renk1, B I Stahl, A Rogl

  • 1Institut für Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany. karl.renk@physik.uni-regensberg.de

Physical Review Letters
|October 4, 2005
PubMed
Summary

Researchers developed a superlattice parametric oscillator (SPO) using a GaAs/AlAs superlattice. This device generates subterahertz radiation, leveraging nonlinear miniband transport for parametric gain.

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Area of Science:

  • Solid-state physics
  • Terahertz technology
  • Semiconductor heterostructures

Background:

  • Superlattice structures exhibit unique electronic properties due to quantum confinement.
  • Parametric oscillators are devices that can amplify signals using a nonlinear medium.
  • Miniband transport in superlattices is sensitive to applied fields and material nonlinearities.

Purpose of the Study:

  • To demonstrate a novel superlattice parametric oscillator (SPO).
  • To investigate the generation of subterahertz radiation using semiconductor superlattices.
  • To explore the role of miniband transport nonlinearity in parametric gain.

Main Methods:

  • Fabrication of a GaAs/AlAs superlattice as the active element.
  • Pumping the superlattice with a microwave field (4 mW).

Related Experiment Videos

  • Characterization of the emitted third harmonic radiation near 300 GHz.

    • Main Results:

    • Successful operation of the SPO was achieved.
    • Third harmonic radiation at subterahertz frequencies (near 300 GHz) was generated.
    • Output power of 0.1 mW was measured for the subterahertz radiation.

    Conclusions:

    • The GaAs/AlAs superlattice functions effectively as the active element in a parametric oscillator.
    • Nonlinearity in miniband transport is identified as the mechanism responsible for parametric gain.
    • The study highlights the potential of superlattices for subterahertz wave generation.