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Proceedings Paper

Metal-dielectric composites with tunable optical properties
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Paper Abstract

We report on the fabrication of a metal-dielectric composite material with tunable optical properties. The developed fabrication method relies on simultaneous DC sputtering of a metal and a suitable dielectric, creating an isotropic material with optical properties that can be controllably varied over a wide range of wavelengths. Currently the research is focusing on a combination of Ag and ZnO that is suitable for applications at the visible and telecommunication frequencies. The material combination is well suited for the deposition method chosen, and physical characterizations using AFM and SEM measurements show that the mixture forms homogeneous films with low surface roughness. In order to test the validity of this approach films are deposited with a variety of deposition parameters, focusing mainly on the relative deposition rates basically controlling the filling factor. Optical properties found from experiments using spectroscopic ellipsometry as well as farfield reflection-transmission measurements are compared to those predicted by the effective medium theory.

Paper Details

Date Published: 29 April 2010
PDF: 10 pages
Proc. SPIE 7711, Metamaterials V, 77111Q (29 April 2010); doi: 10.1117/12.855826
Show Author Affiliations
Rasmus B. Nielsen, Technical Univ. of Denmark (Denmark)
Anders Kristensen, Technical Univ. of Denmark (Denmark)
Jørn M. Hvam, Technical Univ. of Denmark (Denmark)
Alexandra Boltasseva, Technical Univ. of Denmark (Denmark)
Purdue Univ. (United States)
Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)

Published in SPIE Proceedings Vol. 7711:
Metamaterials V
Nigel P. Johnson; Ekmel Özbay; Richard W. Ziolkowski; Nikolay I. Zheludev, Editor(s)

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