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Issue 17, 2020
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Actuated plasmonic nanohole arrays for sensing and optical spectroscopy applications

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Abstract

Herein, we report a new approach to rapidly actuate the plasmonic characteristics of thin gold films perforated with nanohole arrays that are coupled with arrays of gold nanoparticles. The near-field interaction between the localized and propagating surface plasmon modes supported by the structure was actively modulated by changing the distance between the nanoholes and nanoparticles and varying the refractive index symmetry of the structure. This approach was applied by using a thin responsive hydrogel cushion, which swelled and collapsed by a temperature stimulus. The detailed experimental study of the changes and interplay of localized and propagating surface plasmons was complemented by numerical simulations. We demonstrate that the interrogation and excitation of the optical resonance to these modes allow the label-free SPR observation of the binding of biomolecules, and is applicable for in situ SERS studies of low molecular weight molecules attached in the gap between the nanoholes and nanoparticles.

Graphical abstract: Actuated plasmonic nanohole arrays for sensing and optical spectroscopy applications

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Supplementary files

Article information


Submitted
28 Jan 2020
Accepted
30 Mar 2020
First published
22 Apr 2020

This article is Open Access

Nanoscale, 2020,12, 9756-9768
Article type
Paper

Actuated plasmonic nanohole arrays for sensing and optical spectroscopy applications

D. Kotlarek, S. Fossati, P. Venugopalan, N. Gisbert Quilis, J. Slabý, J. Homola, M. Lequeux, F. Amiard, M. Lamy de la Chapelle, U. Jonas and J. Dostálek, Nanoscale, 2020, 12, 9756
DOI: 10.1039/D0NR00761G

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