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

GaAs Cali Dodin 

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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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