Characterisation of fs-laser written refractive index changes using near-field scanning optical microscopy

D. Little*, P. Dekker, A. Rahmani, J. Dawes, G. Marshall, M. Withford

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

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We have performed measurements using a purpose-built Near-field Scanning Optical Microscope and shown that waveguides written with a fs laser in the kHz regime have an asymmetry associated with the unidirectional nature of the writing beam. Further, the asymmetry becomes more pronounced with increasing pulse energy. At very high pulse energies (5-10 J) the presence of multiple guided regions was also observed, indicating that the refractive index profile of the waveguide possesses several maxima, a result which is consistent with current studies on the filamentation process that high-powered laser pulses experience in a dielectric medium. In this paper we will present these observations, their subsequent: analysis and implications for photonic device fabrication using this method.

Original languageEnglish
Title of host publicationPhotonics: Design, Technology, and Packaging III
EditorsWieslaw Z. Krolikowski, Costas M. Soukoulis, Ping Koy Lam, Timothy J. Davis, Shanhui Fan, Yuri S. Kivshar
Place of PublicationBellingham, WA
Number of pages9
ISBN (Print)9780819469724, 0819469726
Publication statusPublished - 2008
EventPhotonics: Design, Technology, and Packaging III - Canberra, Australia
Duration: 5 Dec 20077 Dec 2007


OtherPhotonics: Design, Technology, and Packaging III

Bibliographical note

Copyright 2008 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

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