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Strong terahertz emission from electromagnetic diffusion near cutoff in plasma

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Title
Strong terahertz emission from electromagnetic diffusion near cutoff in plasma
Author(s)
M-H Cho; Kim, YK; Suk, H; Ersfeld, B; Jaroszynski, DA; Hur, MS
Publication Date
2015-04
Journal
NEW JOURNAL OF PHYSICS, v.17, no., pp.043045 -
Publisher
IOP PUBLISHING LTD
Abstract
Anew mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laser-plasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma. We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THz wave. With driving laser pulses of moderate power, the THz wave has a field strength of tens of MV m(-1), a frequency of a few THz and a quasi-continuous power that exceeds all previous monochromatic THz sources. The novelty of the mechanism lies in a diffusing electromagnetic wave close to cut-off, which is modelled by a continuously driven complex diffusion equation
URI
http://pr.ibs.re.kr/handle/8788114/2057
DOI
10.1088/1367-2630/17/4/043045
ISSN
1367-2630
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
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