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

Abstract

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
PublisherIEEE
Pages884-885
Number of pages1
VolumeVols 1 and 2
ISBN (Print)978-1-4244-1438-3
Publication statusPublished - 3 Sep 2007

Fingerprint

pyramids
plasmons
gratings
gold
radiation
pulses
metals
excitation
lasers
silver
silicon dioxide
ionization
glass
air

Keywords

  • terahertz pulse generation
  • surface waves
  • electron emission

Cite this

Welsh, G. H., Hunt, N. T., & Wynne, K. (2007). Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating. In 2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics (Vol. Vols 1 and 2, pp. 884-885). New York: IEEE.
Welsh, G.H. ; Hunt, N.T. ; Wynne, Klaas. / Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating. 2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics. Vol. Vols 1 and 2 New York : IEEE, 2007. pp. 884-885
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Welsh, GH, Hunt, NT & Wynne, K 2007, Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating. in 2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics. vol. Vols 1 and 2, IEEE, New York, pp. 884-885.

Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating. / Welsh, G.H.; Hunt, N.T.; Wynne, Klaas.

2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics. Vol. Vols 1 and 2 New York : IEEE, 2007. p. 884-885.

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating

AU - Welsh, G.H.

AU - Hunt, N.T.

AU - Wynne, Klaas

PY - 2007/9/3

Y1 - 2007/9/3

N2 - 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.

AB - 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.

KW - terahertz pulse generation

KW - surface waves

KW - electron emission

M3 - Chapter

SN - 978-1-4244-1438-3

VL - Vols 1 and 2

SP - 884

EP - 885

BT - 2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics

PB - IEEE

CY - New York

ER -

Welsh GH, Hunt NT, Wynne K. Terahertz-pulse emission by laser excitation of surface plasmons in a metal grating. In 2007 Joint 32nd International Conference on Infrared and Millemeter Waves and 15th International Conference on Terahertz Electronics. Vol. Vols 1 and 2. New York: IEEE. 2007. p. 884-885