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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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. ![]() ![]() ![]() | Item type: | Article |
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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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