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14 March 2018 Laser micromachined SERS substrates in etched fused silica (Conference Presentation)
Katie Murphy , Mark D. Mackenzie, Haonan Chi, Manoj Varma, Parama Pal, Lynn Paterson, Ajoy K. Kar
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Proceedings Volume 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII; 105220E (2018) https://doi.org/10.1117/12.2290195
Event: SPIE LASE, 2018, San Francisco, California, United States
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.
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Katie Murphy , Mark D. Mackenzie, Haonan Chi, Manoj Varma, Parama Pal, Lynn Paterson, and Ajoy K. Kar "Laser micromachined SERS substrates in etched fused silica (Conference Presentation)", Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 105220E (14 March 2018); https://doi.org/10.1117/12.2290195
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KEYWORDS
Silver
Ultrafast lasers
Biomedical optics
Micromachining
Silica
Microfluidics
Nanoparticles
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