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arXiv · 1604.02944

Au-Ag-Cu nano-alloys: tailoring of permittivity

Yoshikazu Hashimoto·Gediminas Seniutinas·Armandas Balcytis·Saulius Juodkazis·Yoshiaki Nishijima
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Abstract

Precious metal alloys enables new possibilities to tailor materials for specific optical functions. Here we present a systematic study of the effects of a nanoscale alloying on the permittivity of Au-Ag-Cu metals at 38 different atomic mixing ratios. The permittivity was measured and analyzed numerically by applying the Drude model. X-ray diffraction (XRD) revealed the face centered cubic lattice of the alloys. Both, optical spectra and XRD results point towards an equivalent composition-dependent electron scattering behavior. Correlation between the fundamental structural parameters of alloys and the resulting optical properties is elucidated. Plasmonic properties of the Au-Ag-Cu alloy nanoparticles were investigated by numerical simulations. Guidelines for designing plasmonic response of nano- structures and their patterns are presented from the material science perspective.

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Yoshikazu Hashimoto, Gediminas Seniutinas, Armandas Balcytis, Saulius Juodkazis, Yoshiaki Nishijima. 2016-04-11. Au-Ag-Cu nano-alloys: tailoring of permittivity. https://doi.org/10.1038/srep25010

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