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Refractive index of Ag nanocrystals composite films in the neighborhood of the surface plasmon resonance

AuthorsSande, J. C. G. de; Serna, Rosalía ; Gonzalo de los Reyes, José; Afonso, Carmen N. ; Hole, D. E.; Naudon, A.
Keywords[PACS] Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
[PACS] Nanocrystals, nanoparticles, and nanoclusters
[PACS] Composite materials
[PACS] Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
[PACS] Collective excitations
[PACS] Nanocrystalline materials
[PACS] Pulsed laser ablation deposition
[PACS] Laser-assisted deposition
Issue Date22-Oct-2001
PublisherAmerican Institute of Physics
CitationJournal of Appled Physics 91(3): 1536-1541 (2002)
AbstractNanocomposite thin films formed by Ag nanocrystals embedded in an amorphous aluminum oxide (Al₂O₃) host were prepared by alternating-target pulsed laser deposition. Spectroscopic ellipsometry was used to determine the effective refractive index (n=n+ik). When the Ag volume fraction is over 2%, the linear optical properties of the nanocomposite films differ from those of the pure dielectric host. The extinction coefficient shows a maximum around 435 nm that is related to the surface plasmon resonance. Near this wavelength, the real part of the refractive index undergoes anomalous dispersion, leading to a significant increase of the n value of the composite compared to that of the matrix
Description6 pags. ; 4 fig. ; 1 tab.
Publisher version (URL)http://dx.doi.org/10.1063/1.1427404
Appears in Collections:(CFMAC-IO) Artículos
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