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Nanomaterials 2018, 8(7), 477; https://doi.org/10.3390/nano8070477

Local Melting of Gold Thin Films by Femtosecond Laser-Interference Processing to Generate Nanoparticles on a Source Target

1
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
2
National Institute of Advanced Industrial Science and Technology, Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
3
Graduate School of Science, Osaka City University, 3-3-138 Sugimoto Sumiyoshi-ku, Osaka 558-8585, Japan
*
Author to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 22 June 2018 / Accepted: 23 June 2018 / Published: 28 June 2018
(This article belongs to the Special Issue Laser-Based Nano Fabrication and Nano Lithography)
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Abstract

Shape- and size-controlled metallic nanoparticles are very important due to their wide applicability. Such particles have been fabricated by chemosynthesis, chemical-vapor deposition, and laser processing. Pulsed-laser deposition and laser-induced dot transfer use ejections of molten layers and solid-liquid-solid processes to fabricate nanoparticles with a radius of some tens to hundreds of nm. In these processes, the nanoparticles are collected on an acceptor substrate. In the present experiment, we used laser-interference processing of gold thin films, which deposited nanoparticles directly on the source thin film with a yield ratio. A typical nanoparticle had roundness fr=0.99 and circularity fcirc=0.869, and the radius was controllable between 69 and 188 nm. The smallest radius was 82 nm on average, and the smallest standard deviation was 3 nm. The simplicity, high yield, and ideal features of the nanoparticles produced by this method will broaden the range of applications of nanoparticles in fields such as plasmonics. View Full-Text
Keywords: femtosecond laser; interference; laser processing; melt; nanoparticle; gold; thin film femtosecond laser; interference; laser processing; melt; nanoparticle; gold; thin film
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Nakata, Y.; Murakawa, K.; Miyanaga, N.; Narazaki, A.; Shoji, T.; Tsuboi, Y. Local Melting of Gold Thin Films by Femtosecond Laser-Interference Processing to Generate Nanoparticles on a Source Target. Nanomaterials 2018, 8, 477.

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