Nanostructured Metal Substrates Fabrication for Surface Enhanced Fluorescence Using the Nanosecond Speckle-Modulated Laser Pulses

Abstract:

Nanosecond speckle-modulated laser pulses were applied to fabricate nanotextured metal substrates for surface enhanced fluorescence (SEF) applications. The speckle-modulated patterns obtained by passing the laser nanosecond pulse through the simplest diffusive object were found suitable for fast large-scale texturing of metal films with micron-sized structures - nanojets, nanobumps and submicron through holes, previous reported only for single-shot nanoablation with tightly focused beams. The optimal regime for pattering the mm-scale areas of Au films with nanojets with an averaged recording density of 10⁵ nanojets per square millimeter were determined and realized. The fabricated nanotextured Au substrates demonstrate spatially uniform SEF signal from the Rhodamine 6G organic dye with averaged 5-fold enhancement factor being compared with unmodified Au surface.

• Periodical: Solid State Phenomena (Volume 247)
• Pages: 54-60
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.247.54
• Online since: March 2016
• Authors: Stanislav O. Gurbatov*, Aleksandr A. Kuchmizhak, Yuriy Nikolaevich Kulchin, Oleg B. Vitrik
• Keywords: Plasmonic Nanostructures, Speckle-Modulated Wave, Surface Enhanced Fluorescence, Surface Laser Modification

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