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 1079-7114 (https://doi.org/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:Article
    ID code:9929
    Dates:
    Date
    Event
    10 January 2007
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:27 Jul 2011 09:09
    Last modified:08 Apr 2024 16:53
    URI:https://strathprints.strath.ac.uk/id/eprint/9929
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