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Proceedings Paper

Laser micromachined SERS substrates in etched fused silica (Conference Presentation)
Author(s): Katie Murphy ; Mark D. Mackenzie; Haonan Chi; Manoj Varma; Parama Pal; Lynn Paterson; Ajoy K. Kar

Paper Abstract

Silver nanoparticles (Ag-NP) with Surface Enhanced Raman Scattering (SERS) activity were fabricated on a fused silica substrate by ultrafast femtosecond laser photoreduction of a silver salt solution. The SERS effectiveness of the Ag-NP increased with laser writing power and number of scans. SEM images show that the Ag-NP have a more uniform density distribution when using a multi-scan writing technique. A number of different laser parameters were compared, including scan speed, laser power, and number of scans. Overall, it was found that the most effective laser parameters were: 20 µms-1 scan speed, 10 mW laser power and 200 scans. The Ag-NP substrates have been used to detect single bacteria and hold promise to give fast, accurate and specific spectra according to the cell specimen present.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 105220E (14 March 2018); doi: 10.1117/12.2290195
Show Author Affiliations
Katie Murphy , Herriot Watt Univ. (United Kingdom)
Mark D. Mackenzie, Heriot-Watt Univ., (United Kingdom)
Haonan Chi, Heriot-Watt Univ. (United Kingdom)
Manoj Varma, Ctr. for Nano Science and Engineering (India)
Parama Pal, TCS - Research and Innovation (India)
Lynn Paterson, Herriot Watt Univ. (United Kingdom)
Ajoy K. Kar, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 10522:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII
Peter R. Herman; Michel Meunier; Roberto Osellame, Editor(s)

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