SURFACE-PLASMON ENHANCED LASER-ABLATION OF THIN METAL-FILMS

P DAWSON*, G CAIRNS

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Surface plasmon enhancement of laser ablation of thin Al films is examined with a view to its application in metal film patterning and nano-structuring. Al films, deposited on silica prisms, are first characterized by attenuated total reflection using a broadband UV source and appropriate interference filter. The films are subsequently subjected to excimer laser radiation of wavelength 248 nm under conditions both of direct incidence from the air side of the film, and of surface plasmon excitation in which light is incident through the prism at greater than critical angle. For a given level of ablation damage in a particular film the fluence required using the surface plasmon technique is 3-5 times less than that needed when direct incidence is used. This is roughly in line with the energy absorbed in the film. From a practical standpoint it is clear that ablation of metal films can be achieved with much lower fluences than has hitherto been possible, thus reducing the requirements on laser output and relaxing the power handling constraints on any input optical elements.

Original languageEnglish
Pages (from-to)1287-1294
Number of pages8
JournalJournal of Modern Optics
Volume41
Issue number6
Publication statusPublished - Jun 1994
Event11th National Quantum Electronics Conference - Belfast, United Kingdom
Duration: 30 Aug 199302 Sep 1993

Keywords

  • VIBRATIONAL-EXCITATION
  • INDUCED DESORPTION
  • SIZE MANIPULATION
  • PHOTODESORPTION
  • DEPOSITION
  • PARTICLES

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