Welsh, G.H., 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. (doi: 10.1103/PhysRevLett.98.026803)
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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.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Wynne, Professor Klaas |
Authors: | Welsh, G.H., Hunt, N.T., and Wynne, K. |
Subjects: | Q Science > QC Physics |
College/School: | College of Science and Engineering > School of Chemistry |
Journal Name: | Physical Review Letters |
Publisher: | American Physical Society |
ISSN: | 0031-9007 |
ISSN (Online): | 1079-7114 |
Published Online: | 10 January 2007 |
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