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High transmission from 2D periodic plasmonic finite arrays with sub-20 nm gaps realized with Ga focused ion beam milling

2020; IOP Publishing; Volume: 31; Issue: 43 Linguagem: Inglês

10.1088/1361-6528/aba57a

1361-6528

Filippo Pisano, Antonio Balena, Muhammad Fayyaz Kashif, Marco Pisanello, Gaia de Marzo, Luciana Algieri, Antonio Qualtieri, Leonardo Sileo, T. Stomeo, A. D’Orazio, Massimo De Vittorio, Ferruccio Pisanello, Marco Grande,

Optical Coatings and Gratings

Plasmonic platforms are a promising solution for the next generation of low-cost, integrated biomedical sensors. However, fabricating these nanostructures often requires lengthy and challenging fabrication processes. Here we exploit the peculiar features of Focused Ion Beam milling to obtain single-step patterning of a plasmonic two-dimensional (2D) array of truncated gold nano-pyramids (TNP), with gaps as small as 17 nm. We describe the formation of plasmonic bandgaps in the arrangement of crossed tapered grooves that separate the nano-pyramids, and we demonstrate refractive index sensing via dark field imaging in patterned areas of 30 $μ$m $\times$ 30 $μ$m.