Received 6 June 2011; published 21 March 2012
By applying a helical electric field along a plasma region, a revolving electron current is formed along the plasma and an elliptically polarized far-field terahertz wave pattern is observed. The observed terahertz wave polarization reveals the remarkable role of velocity retardation between optical pulses and generated terahertz pulses in the generation process. Extensive simulations, including longitudinal propagation effects, are performed to clarify the mechanisms responsible for polarization control of air-plasma-based terahertz sources.
© 2012 American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.108.123903
DOI:
10.1103/PhysRevLett.108.123903
PACS:
42.65.Re, 32.80.Fb, 52.50.Jm
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