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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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

Welsh, G.H. and Hunt, N.T. and Wynne, Klaas (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. IEEE, New York, pp. 884-885. ISBN 978-1-4244-1438-3

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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.