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

作者：Hashimoto Yoshikazu; Seniutinas Gediminas; Balcytis Armandas; Juodkazis Saulius; Nishijima Yoshiaki

来源：Scientific Reports, 2016, 6(1): 25010.

DOI：10.1038/srep25010

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.

• 出版日期2016-4-27