Published August 6, 2020 | Version v1
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High transmission from 2D periodic plasmonic finite arrays with sub-20 nm gaps realized with Ga focused ion beam milling

Description

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.

Technical info

FiP, AB, FeP acknowledge funding from the European Research Council under the European Union's Horizon 2020 research and innovation program (#677683). MP and MDV acknowledge funding from the European Research Council under the European Union's Horizon 2020 research and innovation program (#692643). MP, LS, FeP and MDV are funded by the US National Institute of Health (1UF1NS108177-01). FeP and MDV acknowledge that project leading to this application has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 828972.

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Additional details

Funding

MODEM – Multipoint Optical DEvices for Minimally invasive neural circuits interface 677683
European Commission
NanoBRIGHT – BRInGing nano-pHoTonics into the brain 828972
European Commission

Dates

Available
2020-08-06