Plasmonic coupling in closed-packed ordered gallium nanoparticles.

Scientific Reports
S Catalán-GómezA Redondo-Cubero

Abstract

Plasmonic gallium (Ga) nanoparticles (NPs) are well known to exhibit good performance in numerous applications such as surface enhanced fluorescence and Raman spectroscopy or biosensing. However, to reach the optimal optical performance, the strength of the localized surface plasmon resonances (LSPRs) must be enhanced particularly by suitable narrowing the NP size distribution among other factors. With this purpose, our last work demonstrated the production of hexagonal ordered arrays of Ga NPs by using templates of aluminium (Al) shallow pit arrays, whose LSPRs were observed in the VIS region. The quantitative analysis of the optical properties by spectroscopic ellipsometry confirmed an outstanding improvement of the LSPR intensity and full width at half maximum (FWHM) due to the imposed ordering. Here, by engineering the template dimensions, and therefore by tuning Ga NPs size, we expand the LSPRs of the Ga NPs to cover a wider range of the electromagnetic spectrum from the UV to the IR regions. More interestingly, the factors that cause this optical performance improvement are studied with the universal plasmon ruler equation, supported with discrete dipole approximation simulations. The results allow us to conclude that the...Continue Reading

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Citations

Apr 4, 2021·Sensors·Paulo S S Dos SantosLuís C C Coelho

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Methods Mentioned

BETA
surface plasmon resonance
biosensors
scanning electron microscopy
AFM
biosensing

Software Mentioned

Matlab
DDA
DDSCAT
Gwyddion

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