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Issue 20, 2014
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Vertically stacked plasmonic nanoparticles in a circular arrangement: a key to colorimetric refractive index sensing

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Abstract

True colorimetric sensing produces a linear spectral response of a single peak within the visible light range with various surrounding media refractive indices. We demonstrate how the circular arrangement of hemispheric silver nanoparticles achieves colorimetric properties without modifying the associated full-width-half-maximum values in a broad range of surrounding media refractive indices. We also show that the vertical out-of-plane arrangement of each circular array in nanoholes enhances the signal-to-noise ratio. High electric field confinement at the interface of the nanoparticles and the supporting substrate reveals the effect of the dielectric constant of the substrate and the morphology of the 3D nanoparticle arrays on achieving a single resonance peak in the visible range with a change in the surrounding refractive index. This study opens up the pathway to top-down fabricated nanostructure platform based plasmonic colorimetric sensing with a single resonance peak in the visible range. The studied rich set of tunable geometrical nanostructures enables broadening of the working optical range of the device.

Graphical abstract: Vertically stacked plasmonic nanoparticles in a circular arrangement: a key to colorimetric refractive index sensing

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Publication details

The article was received on 25 Jun 2014, accepted on 06 Aug 2014 and first published on 08 Aug 2014


Article type: Paper
DOI: 10.1039/C4NR03562C
Citation: Nanoscale, 2014,6, 11795-11802
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    Vertically stacked plasmonic nanoparticles in a circular arrangement: a key to colorimetric refractive index sensing

    S. Seo, M. R. Gartia and G. L. Liu, Nanoscale, 2014, 6, 11795
    DOI: 10.1039/C4NR03562C

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