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Graduate Student Seminar - 11/20/2015

"Alloyed Noble Metal Thin-Films with Tunable Dielectric Functions"

by Chen Gong

Friday, November 20, 2015 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Assistant Professor Jeremy Munday

Metallic materials with tunable optical responses can enable the unprecedented control of optoelectronic and nanophotonic devices with enhanced performance, such as thin-film solar cells, metamaterials and metasurfaces. To achieve metallic materials with tunable optical response, we present noble metal alloyed thin-films formed by the binary mixture of Ag, Au, and Cu. We combined transmission and reflection measurements of the alloyed thin-films with a B-spline model that takes into account the Kromers-Kronig relation to experimentally determine the dielectric functions of each alloy, and in some cases a mixture can provide a material with higher surface plasmon polariton quality factor than the corresponding pure metals. Ellipsometry and surface plasmon polariton coupling angle measurements are in excellent agreement when determining the real part of the dielectric function. Our approach paves the way to implement metallic thin-films and nanostructures with tunable optical responses, overcoming the current limitation of the dielectric function of noble metals.

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