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Title: Simulation of terahertz generation in corrugated plasma waveguides

Abstract

We simulate the response of a corrugated plasma channel to an ultrashort laser pulse in two dimensions with the goal of demonstrating the production of terahertz frequency electromagnetic modes. Corrugated channels support electromagnetic modes that have a Floquet-type dispersion relation and thus consist of a sum of spatial harmonics with subluminal phase velocities. This allows the possibility of phase matching between the ponderomotive potential associated with the laser pulse and the electromagnetic modes of the channel. Since the bandwidth of an ultrashort pulse includes terahertz frequencies, significant excitation of terahertz radiation is possible. Here we consider realistic density profiles to obtain predictions of the terahertz power output and mode structure for a channel with periodic boundary conditions. We then estimate pulse depletion effects from our simulation results. The fraction of laser energy converted to terahertz is independent of laser pulse energy in the linear regime, and we find it to be around 1%. Extrapolating to a pulse energy of 0.5 J gives a terahertz power output of 6 mJ with a pulse depletion length of less than 20 cm.

Authors:
; ;  [1]
  1. Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742 (United States)
Publication Date:
OSTI Identifier:
21560291
Resource Type:
Journal Article
Journal Name:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevE.83.056403; (c) 2011 American Institute of Physics; Journal ID: ISSN 1539-3755
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; DENSITY; DISPERSION RELATIONS; EXCITATION; HARMONICS; LASERS; PHASE VELOCITY; PLASMA; PONDEROMOTIVE FORCE; PULSES; SIMULATION; THZ RANGE; WAVEGUIDES; ENERGY-LEVEL TRANSITIONS; FREQUENCY RANGE; OSCILLATIONS; PHYSICAL PROPERTIES; VELOCITY

Citation Formats

Pearson, Andrew J, Palastro, John, and Antonsen, Thomas M. Simulation of terahertz generation in corrugated plasma waveguides. United States: N. p., 2011. Web. doi:10.1103/PHYSREVE.83.056403.
Pearson, Andrew J, Palastro, John, & Antonsen, Thomas M. Simulation of terahertz generation in corrugated plasma waveguides. United States. https://doi.org/10.1103/PHYSREVE.83.056403
Pearson, Andrew J, Palastro, John, and Antonsen, Thomas M. 2011. "Simulation of terahertz generation in corrugated plasma waveguides". United States. https://doi.org/10.1103/PHYSREVE.83.056403.
@article{osti_21560291,
title = {Simulation of terahertz generation in corrugated plasma waveguides},
author = {Pearson, Andrew J and Palastro, John and Antonsen, Thomas M},
abstractNote = {We simulate the response of a corrugated plasma channel to an ultrashort laser pulse in two dimensions with the goal of demonstrating the production of terahertz frequency electromagnetic modes. Corrugated channels support electromagnetic modes that have a Floquet-type dispersion relation and thus consist of a sum of spatial harmonics with subluminal phase velocities. This allows the possibility of phase matching between the ponderomotive potential associated with the laser pulse and the electromagnetic modes of the channel. Since the bandwidth of an ultrashort pulse includes terahertz frequencies, significant excitation of terahertz radiation is possible. Here we consider realistic density profiles to obtain predictions of the terahertz power output and mode structure for a channel with periodic boundary conditions. We then estimate pulse depletion effects from our simulation results. The fraction of laser energy converted to terahertz is independent of laser pulse energy in the linear regime, and we find it to be around 1%. Extrapolating to a pulse energy of 0.5 J gives a terahertz power output of 6 mJ with a pulse depletion length of less than 20 cm.},
doi = {10.1103/PHYSREVE.83.056403},
url = {https://www.osti.gov/biblio/21560291}, journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)},
issn = {1539-3755},
number = 5,
volume = 83,
place = {United States},
year = {2011},
month = {5}
}