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Title

Anomalous dispersion in nanocomposite films at the surface plasmon resonance

AuthorsSerna, Rosalía ; Gonzalo de los Reyes, José; Afonso, Carmen N. ; Sande, J. C. G. de
Issue Date2001
PublisherSpringer
CitationApplied Physics B: Lasers and Optics 73: 339- 343 (2001)
AbstractNanocomposite thin films formed by Cu nanocrystals (NCs) embedded in an amorphous aluminium oxide (Al2O3) host have been prepared by alternate pulsed laser deposition. Spectroscopic ellipsometry is used to determine the effective refractive index (n = n + ik). The extinction coefficient is non-negligible and shows a broad absorption band related to the surface plasmon resonance. In the neighbourhood of this wavelength, the real part of the refractive index undergoes an anomalous dispersion, leading to a significant increase of the n value of the composite compared to that of the host. When the Cu content is low enough, about 2 at. %, the use of an effective medium approach combined with a regression method allows us to determine the metal content and film thickness from the ellipsometric measurements. For larger concentrations this approach is no longer valid.
URIhttp://hdl.handle.net/10261/56911
DOI10.1007/s003400100718
Identifiersdoi: 10.1007/s003400100718
issn: 0946-2171
Appears in Collections:(CFMAC-IO) Artículos
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