Welsh, G.H. and Wynne, K. (2009) Generation of ultrafast terahertz radiation pulses on metallic nanostructured surfaces. Optics Express, 17(4), pp. 2470-2480. (doi: 10.1364/OE.17.002470)
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Publisher's URL: http://dx.doi.org/10.1364/OE.17.002470
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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Wynne, Professor Klaas |
| Authors: | Welsh, G.H., and Wynne, K. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Optics Express |
| Publisher: | Optical Society of America |
| ISSN: | 1094-4087 |
| ISSN (Online): | 1094-4087 |
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