Metal-dielectric composites with tunable optical properties

Rasmus B. Nielsen; Anders Kristensen; Jørn M. Hvam; Alexandra Boltasseva

doi:10.1117/12.855826

29 April 2010 Metal-dielectric composites with tunable optical properties

Rasmus B. Nielsen, Anders Kristensen, Jørn M. Hvam, Alexandra Boltasseva

Proceedings Volume 7711, Metamaterials V; 77111Q (2010) https://doi.org/10.1117/12.855826
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

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.

Citation Download Citation

Rasmus B. Nielsen, Anders Kristensen, Jørn M. Hvam, and Alexandra Boltasseva "Metal-dielectric composites with tunable optical properties", Proc. SPIE 7711, Metamaterials V, 77111Q (29 April 2010); https://doi.org/10.1117/12.855826

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