Laser fabricated ripple substrates for surface-enhanced Raman scattering

Authors

  • R. Buividas,

    Corresponding author
    1. Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
    • Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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    • Phone: +61 3 9214 8276, Fax: +61 3 9214 3435

  • P.R. Stoddart,

    1. Centre for Atom Optics and Ultrafast Spectroscopy, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
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  • S. Juodkazis

    1. Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
    2. Melbourne Centre for Nanofabrication, 151 Wellington Road, Clayton, VIC 3168, Australia
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Abstract

Femtosecond laser fabricated surface nanograting structures, referred to as ripples, are proposed as efficient substrates for surface-enhanced Raman scattering (SERS). Ripple substrates show order of magnitude higher sensitivity and superior reproducibility as compared to lithographically made commercial SERS sensing substrates. It is demonstrated that the SERS intensity from ripple substrates scales with the thickness of the Au coating. Ag coating on sapphire ripples showed > 2000 times higher sensitivity as compared to the same coating on the flat sapphire surface. The period, duty cycle and aspect ratio of the ripple textures can be adjusted by laser ablation conditions, which could be used for plasmon resonance tuning.

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