Broadband semiconductor superlattice detector for THz radiation

Klappenberger, F.; Ignatov, A. A.; Winnerl, S.; Schomburg, E.; Wegscheider, W.; Renk, K. F.; Bichler, M.
March 2001
Applied Physics Letters;3/19/2001, Vol. 78 Issue 12, p1673
Academic Journal
We report on a broadband GaAs/AlAs superlattice detector for THz radiation; a THz field reduces the current through a superlattice, which is carried by miniband electrons, due to modulation of the Bloch oscillations of the miniband electrons. We studied the detector response, by use of a free electron laser, in a large frequency range (5-12 THz). The responsivity showed strong minima at frequencies of infrared active phonons of the superlattice. A theoretical analysis of the detector delivers an understanding of the role of phonons and gives a characterization of the responsivity. © 2001 American Institute of Physics.


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