Effect of clustering on the surface plasmon band in thin films of metallic nanoparticles

Rui M. S. Pereira; Joel Borges; Filipa C. R. Peres; Paulo A. S. Pereira; Georgi V. Smirnov; Filipe Vaz; Albano Cavaleiro; Mikhail I. Vasilevskiy

doi:10.1117/1.JNP.9.093796

23 December 2014 Effect of clustering on the surface plasmon band in thin films of metallic nanoparticles

Rui M. S. Pereira, Joel Borges, Filipa C. R. Peres, Paulo A. S. Pereira, Georgi V. Smirnov, Filipe Vaz, Albano Cavaleiro, Mikhail I. Vasilevskiy

Author Affiliations +

Journal of Nanophotonics, Vol. 9, Issue 1, 093796 (December 2014). https://doi.org/10.1117/1.JNP.9.093796

Abstract

We theoretically investigate the optical response of ensembles of polarizable metallic nanoparticles (NPs) that form (1) submonolayer films of particles adsorbed on a dielectric substrate, considered as two-dimensional (2-D) systems, and (2) thin three-dimensional (3-D) films, where NPs are embedded in a dielectric matrix. For system (1), the effect of NPs’ distance to the substrate is taken into account. In both cases, we find that short-range clustering leads to a broadening and a spectral shift of the absorption band related to the surface plasmon resonance (SPR) in individual NPs. We show that the clustering can help in achieving spectrally broad SPR bands, especially if NPs aggregate into fractal clusters, which can be interesting for some applications such as surface-enhanced Raman scattering. In particular, submonolayer films on NPs generated using the diffusion-limited aggregation algorithm produce sizable and spectrally broad absorption, which can be tuned to the visible range by choosing an appropriate capping and/or substrate material. Calculated results for thin 3-D films are compared with experimental data obtained for Au/TiO₂ nanocomposite layers produced by reactive cosputtering.

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Rui M. S. Pereira, Joel Borges, Filipa C. R. Peres, Paulo A. S. Pereira, Georgi V. Smirnov, Filipe Vaz, Albano Cavaleiro, and Mikhail I. Vasilevskiy "Effect of clustering on the surface plasmon band in thin films of metallic nanoparticles," Journal of Nanophotonics 9(1), 093796 (23 December 2014). https://doi.org/10.1117/1.JNP.9.093796

Published: 23 December 2014

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