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Proceedings Paper

Superlattice detector as a fast direct detector and autocorrelator for terahertz radiation
Author(s): Stephan Winnerl; Ekkehard Schomburg; S. Brandl; F. Klappenberger; Karl F. Renk; Alexander F. G. van der Meer; J. N. Hovenier; R. van Es; T. Klaasen; A. A. Ignatov; Nikolai N. Ledentsov; Victor M. Ustinov; Alexey E. Zhukov; Alexey R. Kovsh; Petr S. Kop'ev
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Paper Abstract

We report on a GaAs/AlAs superlattice detector as a novel direct detector and autocorrelator for THz radiation. It is based on a doped wide-miniband GaAs/AlAs superlattice, with submonolayer AlAs barrier layers; the superlattice is operated at room temperature. THz radiation, generated by a free-electron laser and a mode locked p-Ge laser, was coupled into the superlattice via a corner cube antenna system. THz-irradiation of the biased superlattice resulted in a current reduction, which was monitored. The direct detector showed a fast response (20 ps, limited by the electronic circuit) and was robust against intense radiation pulses (peak power 10 kW). The responsivity was 100 times higher than the responsivity of detectors of comparable risetime and comparable robustness. Intense THz radiation caused a complete suppression of the current through the superlattice. This is the basis of the superlattice autocorrelator. The superlattice autocorrelator could resolve picosecond radiation pulses.

Paper Details

Date Published: 12 November 1999
PDF: 10 pages
Proc. SPIE 3795, Terahertz and Gigahertz Photonics, (12 November 1999); doi: 10.1117/12.370155
Show Author Affiliations
Stephan Winnerl, Univ. Regensburg (Germany)
Ekkehard Schomburg, Univ. Regensburg (Germany)
S. Brandl, Univ. Regensburg (Germany)
F. Klappenberger, Univ. Regensburg (Germany)
Karl F. Renk, Univ. Regensburg (Germany)
Alexander F. G. van der Meer, FOM-Institute for Plasma Physics (Netherlands)
J. N. Hovenier, Delft Univ. of Technology (Netherlands)
R. van Es, Delft Univ. of Technology (Netherlands)
T. Klaasen, Delft Univ. of Technology (Netherlands)
A. A. Ignatov, Nizhny Novgorod State Univ. (Russia)
Nikolai N. Ledentsov, A.F. Ioffe Physico-Technical Institute (Germany)
Victor M. Ustinov, A.F. Ioffe Physico-Technical Institute (Russia)
Alexey E. Zhukov, A.F. Ioffe Physico-Technical Institute (Russia)
Alexey R. Kovsh, A.F. Ioffe Physico-Technical Institute (Russia)
Petr S. Kop'ev, A.F. Ioffe Physico-Technical Institute (Russia)

Published in SPIE Proceedings Vol. 3795:
Terahertz and Gigahertz Photonics
R. Jennifer Hwu; Ke Wu, Editor(s)

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