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Far-field plasmonic coupling in 2-dimensional polycrystalline plasmonic arrays enables wide tunability with low-cost nanofabrication

Abstract

We report the experimental observation and numerical modeling study of far-field plasmonic coupling (FFPC) in 2-dimensional polycrystalline plasmonic arrays consisting of “single crystalline” domains of random size and orientation. Even though polycrystalline plasmonic arrays are routine products of low-cost nanosphere lithography (NSL), their FFPC behavior has not been well understood. Herein, FFPC observed from gold nanodisk (AuND) arrays fabricated using NSL appears qualitatively in keeping with that of highly regular nanoparticle arrays, where they induced cyclic modulations on the peak position and linewidth of the localized surface plasmon resonance (LSPR). Remarkable blue shifts as much as 1000 nm with nearly doubled linewidth were observed experimentally. Numerical modeling was systematically carried out and showed quantitative agreement with the experimental results. Through the modeling approach, the influence of array randomness and particle size on FFPC has been studied independently for the first time. Finally, two potential applications are developed for FFPC-based LSPR tuning. Firstly, when AuND arrays are fabricated on flexible substrates, a novel transduction mechanism can be established between LSPR peak position and substrate strain. Owing to the far-field propagating nature, FFPC-based transduction can effectively extend the strain-tuning displacement range by an order of magnitude compared with those based on near-field coupling. Secondly, we show that FFPC leads to a LSPR peak within 1 μm for nanoporous gold disk arrays which otherwise has single particle LSPR peak beyond 1.5 μm. Such significant FFPC-induced blue shift is critically important for compatibility with the use of silicon-based detectors.

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Publication details

The article was received on 11 May 2017, accepted on 01 Jun 2017 and first published on 01 Jun 2017


Article type: Communication
DOI: 10.1039/C7NH00067G
Citation: Nanoscale Horiz., 2017, Accepted Manuscript
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    Far-field plasmonic coupling in 2-dimensional polycrystalline plasmonic arrays enables wide tunability with low-cost nanofabrication

    F. Zhao, M. M. P. Arnob, O. Zenasni, J. Li and W. Shih, Nanoscale Horiz., 2017, Accepted Manuscript , DOI: 10.1039/C7NH00067G

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