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 . ISSN 0031-9007 (doi:10.1103/PhysRevLett.98.026803)
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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.
|Glasgow Author(s):||Wynne, Prof 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|
|Published Online:||10 January 2007|