Tuning the effective dielectric function of thin film metal-dielectric composites by controlling the deposition temperature

Sancho-Parramon, Jordi; Janicki, Vesna; Zorc, Hrvoje (2011) Tuning the effective dielectric function of thin film metal-dielectric composites by controlling the deposition temperature. Journal of Nanophotonics, 5 . 051805-1-051805-8. ISSN 1934-2608

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Abstract

The influence of the substrate temperature on the effective optical behavior of Ag-SiO2 composites obtained by electron beam evaporation was studied. Optical characterization of the composites was performed by means of spectroscopic ellipsometry measurements. The effective dielectric function of the composites, modeled using a multiple oscillator approach, could be widely tuned by controlling the deposition temperature. The spectral dependence of the composite absorption appeared to be better described with a Gaussian line shape than with the classical Lorentz oscillator model. The description of the effective dielectric function using standard effective medium theories failed and the experimental results could be explained only in the general framework of the Bergman spectral density theory.

Item Type:

Article

Additional Information:

Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Uncontrolled Keywords:

metal-dielectric composites; metal island films; surface plasmon resonance; optical constants; effective medium theory; spectroscopic ellipsometry

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Laser and Atomic Research and Development

Projects: