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Updated: May 30, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
Directionality of terahertz emission from photoinduced gas plasmas
C Köhler1, E Cabrera-Granado, I Babushkin
1Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany. koehler@pks.mpg.de
Abstract:
Forward and backward terahertz emission by ionizing two-color laser pulses in gas is investigated by means of a simple semianalytical model based on Jefimenko's equations and rigorous Maxwell simulations in one and two dimensions. We find the emission in the backward direction has a much smaller spectral bandwidth than in the forward direction and explain this by interference effects. Forward terahertz radiation is generated predominantly at the ionization front and is thus almost not affected by the opacity of the plasma, in excellent agreement with results obtained from a unidirectional pulse propagation model.
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