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

Author:

Pisano FilippoORCID,Balena AntonioORCID,Kashif Muhammad FayyazORCID,Pisanello MarcoORCID,de Marzo GaiaORCID,Algieri LucianaORCID,Qualtieri AntonioORCID,Sileo Leonardo,Stomeo TizianaORCID,D’Orazio Antonella,De Vittorio Massimo,Pisanello FerruccioORCID,Grande MarcoORCID

Abstract

Abstract Fabricating plasmonic nanostructures with good optical performances often requires lengthy and challenging patterning processes that can hardly be transferred to unconventional substrates, such as optical fiber tips or curved surfaces. Here we investigate the use of a single Ga focused ion beam process to fabricate 2D arrays of gold nanoplatelets for nanophotonic applications. While observing that focused ion beam milling of crossing tapered grooves inherently produces gaps below 20 nm, we provide experimental and theoretical evidence for the spectral features of grooves terminating with a sharp air gap. We show that transmission near 10% can be obtained via two-dimensional nano-focusing in a finite subset of 2D arrays of gold nanoplatelets. This enables the application of our nanostructure to detect variations in the refractive index of thin films using either reflected or transmitted light when a small number of elements are engaged.

Funder

H2020 European Research Council

Foundation for the National Institutes of Health

European Union’s Horizon 2020 research and innovation programme

Publisher

IOP Publishing

Subject

Electrical and Electronic Engineering,Mechanical Engineering,Mechanics of Materials,General Materials Science,General Chemistry,Bioengineering

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