Special Section on Nanoplasmonics

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

[+] Author Affiliations
Rui M. S. Pereira

Universidade do Minho, Centro de Física, Campus de Gualtar, 4710-057 Braga, Portugal

Universidade do Minho, Centro de Matemática, Campus de Gualtar, 4710-057 Braga, Portugal

Universidade do Minho, Departamento de Matemática e Aplicações, Campus de Gualtar, 4710-057 Braga, Portugal

Joel Borges

Universidade do Minho, Centro de Física, Campus de Gualtar, 4710-057 Braga, Portugal

Universidade de Coimbra, SEG-CEMUC-Departamento de Engenharia Mecânica, 3030-788 Coimbra, Portugal

Instituto Pedro Nunes, Laboratório de Ensaios, Desgaste e Materiais, Rua Pedro Nunes, 3030-199 Coimbra, Portugal

Filipa C. R. Peres, Filipe Vaz, Mikhail I. Vasilevskiy

Universidade do Minho, Centro de Física, Campus de Gualtar, 4710-057 Braga, Portugal

Paulo A. S. Pereira

Universidade do Minho, Centro de Matemática, Campus de Gualtar, 4710-057 Braga, Portugal

Universidade do Minho, Departamento de Matemática e Aplicações, Campus de Gualtar, 4710-057 Braga, Portugal

Georgi V. Smirnov

Universidade do Minho, Centro de Física, Campus de Gualtar, 4710-057 Braga, Portugal

Universidade do Minho, Departamento de Matemática e Aplicações, Campus de Gualtar, 4710-057 Braga, Portugal

Albano Cavaleiro

Universidade de Coimbra, SEG-CEMUC-Departamento de Engenharia Mecânica, 3030-788 Coimbra, Portugal

J. Nanophoton. 9(1), 093796 (Dec 23, 2014). doi:10.1117/1.JNP.9.093796
History: Received October 17, 2014; Accepted November 25, 2014
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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.

Figures in this Article
© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Rui M. S. Pereira ; Joel Borges ; Filipa C. R. Peres ; Paulo A. S. Pereira ; Georgi V. Smirnov, et al.
"Effect of clustering on the surface plasmon band in thin films of metallic nanoparticles", J. Nanophoton. 9(1), 093796 (Dec 23, 2014). ; http://dx.doi.org/10.1117/1.JNP.9.093796


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