Nano-surface patterning by femtosecond laser for plasmonic surface optical applications

Go Obara; Tomoya Miyanishi; Yuto Tanaka; Mitsuhiro Terakawa; Minoru Obara

doi:10.1117/12.881486

15 November 2010 Nano-surface patterning by femtosecond laser for plasmonic surface optical applications

Go Obara, Tomoya Miyanishi, Yuto Tanaka, Mitsuhiro Terakawa, Minoru Obara

Proceedings Volume 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 77511Y (2010) https://doi.org/10.1117/12.881486
Event: 18th International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2010, Sofia, Bulgaria

Abstract

For plasmonic surface optical applications, localized optical field distribution properties in the vicinity of gold particles on a silicon substrate by backward and forward irradiation are presented. It is technically difficult to fabricate nanostructure on the surface by conventional forward laser incidence to the substrate because gold nanoparticles easily aggregate to form double-layered particle arrays. We calculated enhanced optical field properties in order to pattern the substrate surface only with a template of the bottom-layered particle arrays in case that the backward irradiation of femtosecond laser is used in the system of aggregated double-layered gold nanoparticle arrays. With the backward irradiation, the optical field intensity in the substrate for the double-layered hexagonal arrays is found to be only 30% lower than the mono-layered system. Moreover, near-field cannot be generated with the forward irradiation. As a result, only the backward irradiation scheme is found to be effective for uniform surface nanopatterning at enhanced plasmonic near-field zones.

Citation Download Citation

Go Obara, Tomoya Miyanishi, Yuto Tanaka, Mitsuhiro Terakawa, and Minoru Obara "Nano-surface patterning by femtosecond laser for plasmonic surface optical applications", Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 77511Y (15 November 2010); https://doi.org/10.1117/12.881486

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