Relativistic Doppler frequency up-conversion of terahertz pulses via reflection from photo-induced plasma fronts in solid-state media

Mark D. Thomson; Fanqi Meng; Hartmut G. Roskos

doi:10.1117/12.2186752

31 August 2015 Relativistic Doppler frequency up-conversion of terahertz pulses via reflection from photo-induced plasma fronts in solid-state media

Mark D. Thomson, Fanqi Meng, Hartmut G. Roskos

Author Affiliations +

Proceedings Volume 9585, Terahertz Emitters, Receivers, and Applications VI; 95850G (2015) https://doi.org/10.1117/12.2186752
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

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.

Citation Download Citation

Mark D. Thomson, Fanqi Meng, and Hartmut G. Roskos "Relativistic Doppler frequency up-conversion of terahertz pulses via reflection from photo-induced plasma fronts in solid-state media", Proc. SPIE 9585, Terahertz Emitters, Receivers, and Applications VI, 95850G (31 August 2015); https://doi.org/10.1117/12.2186752

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