Abstract

Metal nanostructured materials have generated considerable interest owing to ultrafast response and large nonlinearity in plasmonics. This research is aimed to clarify the spectral dependence of χ⁽³⁾, which is strongly influenced by the geometries and materials. Thin films and spherical nanoparticles of Au, Ag and TiN were fabricated. Particularly, Ag nanoparticles were fabricated with sizes ranging from 3 to 16 nm for size quantization. Triangular plates, nanorods and nanobipyramids of Au nanoparticles were synthesized for geometry influence. All the nanoparticles were embedded in PVA (Au, TiN) or SiO₂ substrate for further characterization. χ⁽³⁾ was evaluated by a combined analysis of spectroscopic ellipsometry and pump probe spectroscopy.

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)