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Proceedings Paper

Terahertz-pulse emission through excitation of surface plasmons in metallic nanostructures
Author(s): Gregor H. Welsh; Klaas Wynne
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Paper 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 relying on the excitation of surface plasmons (SPs) in metallic nanostructures. Multiphoton ionization and ponderomotive acceleration of electrons in the enhanced evanescent field of the SPs, 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.

Paper Details

Date Published: 14 February 2008
PDF: 11 pages
Proc. SPIE 6892, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII, 68921E (14 February 2008); doi: 10.1117/12.759115
Show Author Affiliations
Gregor H. Welsh, Univ. of Strathclyde (United Kingdom)
Klaas Wynne, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 6892:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XII
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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