Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating

G.H. Welsh, N.T. Hunt, Klaas Wynne

Research output: Chapter in Book/Report/Conference proceedingChapter


Metallic nanostructures have been prepared by depositing thin layers of gold onto a fused-silica transmission grating. Excitation with 800-nm femtosecond laser pulses in air results in the emission of terahertz radiation with an angle-dependent efficiency and a third-order dependence on input power. Nanostructures consisting of metal nano-pyramids on glass as well as silver nano-pyramid arrays covered in gold also exhibit terahertz emission. We will show that the source of the terahertz radiation in all of these cases is surface-plasmon-assisted multiphoton ionisation and ponderomotive acceleration in the evanescent laser field.
Original languageEnglish
Title of host publication2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics
Place of PublicationNew York
Number of pages1
VolumeVols 1 and 2
ISBN (Print)978-1-4244-1438-3
Publication statusPublished - 3 Sep 2007


  • terahertz pulse generation
  • surface waves
  • electron emission


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