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Laser excitation of terahertz surface plasma wave over a hollow capillary plasma

Published online by Cambridge University Press:  28 December 2015

Rohtash Singh  and
V. K. Tripathi
Rohtash Singh*
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi-110016, India
V. K. Tripathi
Affiliation:
Physics Department, Indian Institute of Technology Delhi, New Delhi-110016, India
*
Address correspondence and reprint request to: Rohtash Singh, Physics Department, Indian Institute of Technology Delhi, New Delhi-110016, India. E-mail: [email protected]
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Abstract

Two collinear laser pulses of finite spot size propagating through a capillary plasma, modeled as a hollow plasma cylinder, are shown to produce beat frequency terahertz (THz) surface plasmons at the inner surface. The evanescent laser fields in the plasma impart oscillatory velocity to electrons and exert a beat ponderomotive force on them. The static component of the ponderomotive force inhibits plasma from filling the vacuum region while the beat frequency component produces a nonlinear current (${\vec J^{{\;\rm NL}}}$) that drives the difference frequency THz surface plasma wave (SPW). Phase matching for the THz surface wave excitation is achieved when the group velocity of the lasers equals the phase velocity of the beat frequency SPW. At laser intensities of ~1014 W/cm2 at 10 μm wavelength, one may attain normalized surface wave amplitude ~ 0.03.

Keywords

Capillary plasmaPhase matchingPlasmonsPonderomotiveTerahertz
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 1 , March 2016 , pp. 109 - 114
Copyright
Copyright © Cambridge University Press 2015 

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