Transparency and stability of Ag-based metal–dielectric multilayers

Abstract

We fabricated and tested periodic metal (Ag)–dielectric (${\mathrm{SiO}}_2$ or ${\mathrm{TiO}}_2$) multilayers with transparency bands in the visible range. For samples with $\mathrm{Ag}–{\mathrm{TiO}}_2$ interfaces, the optical properties exhibited relatively poor predictability, likely due to oxidation of the Ag layers. $\mathrm{Ag}/{\mathrm{SiO}}_2$-based multilayers were found to be more predictable and stable, but the relatively low refractive index of ${\mathrm{SiO}}_2$ limits their inherent transparency and pass-band bandwidth. We show that termination of the multilayer with a single high-index layer reduces the admittance mismatch with the ambient media, and thus improves the properties of the transparency band.

© 2013 Optical Society of America

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