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Graduate Student Seminar - 11/18/2016

"Metallic Materials for Plasmonics"

by Chen Gong

Friday, November 18, 2016 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Assistant Professor Marina Leite

Metallic materials with tunable optical responses can enable the unprecedented control of surface plasmon polariton (SPP) in metal thin films and localized surface plasmon resonance in metallic nanostructures. This can enable the development of optoelectronic and nanophotonic devices, such as thin-film solar cells and metamaterials for tunable absorbers, with enhanced performance. Here we present the alloying of noble metals, Ag, Au, and Cu, to develop a novel class of materials with tunable optical response, which have not been achieved by pure metals. We fabricate binary alloyed thin films with controlled chemical composition via cosputtering. Ellipsometry and SPP angle coupling measurements are used to determine the real part of the dielectric function and found an excellent agreement. Moreover, we fabricate size and composition controlled Ag-Au alloy nanoparticles (NPs) by a deposit-and-anneal method. Spectrally dependent near-field scanning optical microscopy shows the nanoscale optical properties around the alloy NPs. Our approach paves the way to implement metallic thin films and nanostructures with tunable optical properties for different applications.

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