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Far Field Optical Properties of a Monolayer of SiO2 Spheres and Small Au Nanoparticles

Published online by Cambridge University Press:  19 February 2019

A. Santos Gómez  and
A. L. González
A. Santos Gómez
Affiliation:
Instituto de Física, Benemérita Universidad Autónoma de Puebla. Apdo. Post. J-48, Puebla, Pue., 72570, México.
A. L. González*
Affiliation:
Instituto de Física, Benemérita Universidad Autónoma de Puebla. Apdo. Post. J-48, Puebla, Pue., 72570, México.
*
*(Email: [email protected])
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Abstract

Here, we present a numerical study of the far field optical response of a monolayer composed by an hexagonal closed packed array of SiO2 spheres with a single Au NP at each interstitial position. The Optical Efficiencies, Reflection, Transmission and Absorption at normal incidence, were calculated using Discrete Dipole Approximation model extended to periodic targets. In order to consider different amounts of loads of Au NPs per unit of area in the monolayer, we have fixed the diameter of Au NPs (9 nm) and varied the diameter of the SiO2 spheres. The numerical calculations indicate that Au-SiO2 composite monolayers can absorb and scatter the incident electromagnetic wave, as the load of Au NPs increases the monolayer becomes less transparent to light and the spectra are red-shifted. The profile of the absorption spectrum of the Au-SiO2 composite monolayer is very similar to that of a Au NPs monolayer (composite monolayer without the Silica spheres) but less intense, presumably because the Silica spheres screen the coupling of the Localized Surface Plasmons of Au NPs.

Keywords

2D materialsabsorptionnanostructuremodeling
Type
Articles
Information
MRS Advances , Volume 3 , Issue 64: International Materials Research Congress XXVII , 2018 , pp. 3917 - 3923
Copyright
Copyright © Materials Research Society 2019 

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