Terahertz-pulse emission through laser excitation of surface plasmons in a metal grating

Welsh, G.H. and Hunt, N.T. and Wynne, K. (2007) Terahertz-pulse emission through laser excitation of surface plasmons in a metal grating. Physical Review Letters, 98 (2). 026803. ISSN 0031-9007

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Official URL: https://doi.org/10.1103/PhysRevLett.98.026803

Abstract

The second-order processes of optical-rectification and photoconduction are well known and widely used to produce ultrafast electromagnetic pulses in the terahertz frequency domain. We present a new form of rectification that relies on the excitation of surface plasmons in metal films deposited on a shallow grating. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the surface plasmons results in a femtosecond current surge and emission of terahertz electromagnetic radiation. Using gold, this rectification process is third or higher-order in the incident field.

Creators(s):	Welsh, G.H. ORCID: https://orcid.org/0000-0001-7933-4190, Hunt, N.T. ORCID: https://orcid.org/0000-0001-7400-5152 and Wynne, K. ORCID: https://orcid.org/0000-0002-5305-5940;
Item type:	Article
ID code:	9929
Keywords:	optical-rectification , photoconduction , electromagnetic pulses, acceleration , Physics, Physics and Astronomy(all)
Subjects:	Science > Physics
Department:	Faculty of Science > Physics
Depositing user:	Strathprints Administrator
Date deposited:	27 Jul 2011 09:09
Last modified:	22 Jan 2021 04:25
URI:	https://strathprints.strath.ac.uk/id/eprint/9929
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