Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces

G.H. Welsh, K. Wynne

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

A resonant "incoherent" rectification process is presented relying on the excitation of surface plasmons on a nanostructured metal surface. Excitation of gold and silver films with 800-nm femtosecond laser pulses results in the emission of terahertz radiation with an angle-dependent efficiency and an approximately third-order power dependence. It is shown that the source of this terahertz pulse generation is the surface-plasmon-assisted multiphoton ionization and ponderomotive acceleration in the evanescent field of the surface plasmon. Simple models are used to understand the forces and dynamics near the surface.
LanguageEnglish
Pages2470-2480
Number of pages10
JournalOptics Express
Volume17
Issue number4
DOIs
Publication statusPublished - 16 Feb 2009

Fingerprint

radiation
pulses
rectification
plasmons
excitation
metal surfaces
silver
gold
ionization
lasers

Keywords

  • evanescent wave acceleration
  • optical rectification
  • charge transfer
  • emission
  • films
  • photoemission
  • spectroscopy
  • multiphoton
  • excitation

Cite this

Welsh, G.H. ; Wynne, K. / Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces. In: Optics Express. 2009 ; Vol. 17, No. 4. pp. 2470-2480.
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Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces. / Welsh, G.H.; Wynne, K.

In: Optics Express, Vol. 17, No. 4, 16.02.2009, p. 2470-2480.

Research output: Contribution to journalArticle

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AB - A resonant "incoherent" rectification process is presented relying on the excitation of surface plasmons on a nanostructured metal surface. Excitation of gold and silver films with 800-nm femtosecond laser pulses results in the emission of terahertz radiation with an angle-dependent efficiency and an approximately third-order power dependence. It is shown that the source of this terahertz pulse generation is the surface-plasmon-assisted multiphoton ionization and ponderomotive acceleration in the evanescent field of the surface plasmon. Simple models are used to understand the forces and dynamics near the surface.

KW - evanescent wave acceleration

KW - optical rectification

KW - charge transfer

KW - emission

KW - films

KW - photoemission

KW - spectroscopy

KW - multiphoton

KW - excitation

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