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Proceedings Paper

Relativistic Doppler frequency up-conversion of terahertz pulses via reflection from photo-induced plasma fronts in solid-state media
Author(s): Mark D. Thomson; Fanqi Meng; Hartmut G. Roskos
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Paper Abstract

We have recently proposed and investigated the use of the relativistic Doppler reflection to up-shift the frequency of incident THz pulses, where the reflecting boundary is realized by a charge-carrier plasma front generated by a counter-propagating optical pump pulse in a semiconductor medium. In light of experimental results with high-resistivity silicon as the medium, here we employ numerical simulations to examine the effects of (i) the scattering time and (ii) pre-excitation of the plasma before the main pulse, which both can have a profound impact on the frequency up-conversion. These results also suggest that the initial effective Drude scattering time in silicon (before thermalization) may be below 10 femtoseconds, exemplifying the use of the Doppler reflective geometry as a novel probe of initial charge-carrier dynamics.

Paper Details

Date Published: 31 August 2015
PDF: 8 pages
Proc. SPIE 9585, Terahertz Emitters, Receivers, and Applications VI, 95850G (31 August 2015); doi: 10.1117/12.2186752
Show Author Affiliations
Mark D. Thomson, Johann Wolfgang Goethe-Univ. Frankfurt am Main (Germany)
Fanqi Meng, Johann Wolfgang Goethe-Univ. Frankfurt am Main (Germany)
Hartmut G. Roskos, Johann Wolfgang Goethe-Univ. Frankfurt am Main (Germany)


Published in SPIE Proceedings Vol. 9585:
Terahertz Emitters, Receivers, and Applications VI
Manijeh Razeghi; Alexei N. Baranov; John M. Zavada; Dimitris Pavlidis, Editor(s)

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