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Strong Terahertz-Photocurrent Resonances in Miniband Superlattices at the Bloch Frequency

  • K. Unterrainer
  • B. J. Keay
  • M. C. Wanke
  • S. J. Allen
  • D. Leonard
  • G. Medeiros-Ribeiro
  • U. Bhattacharya
  • M. J. W. Rodwell

Abstract

We have observed resonant changes in the current-voltage characteristics of miniband semiconductor superlattices when the Bloch frequency is resonant with a terahertz field and its harmonics. This corresponds to absorption and gain of THz radiation in the Wannier Stark ladder of the superlattice. The resonant feature consists of a peak in the current which grows with increasing laser intensity accompanied by a decrease of the current at the low bias side. When the intensity is increased further the first peak starts to decrease and a second peak at about twice the voltage of the first peak is observed due to a two-photon resonance. At the highest intensities we observe up to a four-photon resonance.

Keywords

Bloch Oscillation Photon Resonance Increase Laser Intensity Terahertz Field Wannier Stark Ladder 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • K. Unterrainer
    • 1
  • B. J. Keay
    • 1
  • M. C. Wanke
    • 1
  • S. J. Allen
    • 1
  • D. Leonard
    • 2
  • G. Medeiros-Ribeiro
    • 2
  • U. Bhattacharya
    • 2
  • M. J. W. Rodwell
    • 2
  1. 1.Center for Free -Electron Laser StudiesUSA
  2. 2.Materials and ECE DepartmentUniversity of California, Santa BarbaraSanta BarbaraUSA

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