11:30 〜 11:45
▼ [21a-E214-9] Experimental Investigation of Third-order Susceptibility: Effect of Geometries and Materials
キーワード：nonlinear optics, third-order susceptibility
Metal nanostructured materials have generated considerable interest owing to ultrafast response and large nonlinearity in plasmonics. This research is aimed to clarify the spectral , 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. was evaluated by a combined analysis of spectroscopic ellipsometry and pump probe spectroscopy.
The results are discussed in three parts. (1) Interband and intraband contributions of :Through the comparison between of Au thin film (only interband transitions excited) and Au nanoparticles (both interband and intraband transitions contributed), we separated the two components of . (2) Geometry factors: The investigation of Ag nanoparticles with different sizes and Au nanoparticles with different shapes results that is strongly influenced by geometry factors. The quantum size effect and local filed effect are discussed and compared. (3) Broadband SPR response of TiN: Traditional plasmonic materials suffer from low optical thresholds that limit their usages. Titanium nitride has shown superior properties such as thermal stability, low cost and CMOS-compatible fabrication process. We experimentally obtained of TiN thin film and nanoparticles in an unprecedented wide bandwidth range with a broadband response.
The results are discussed in three parts. (1) Interband and intraband contributions of :Through the comparison between of Au thin film (only interband transitions excited) and Au nanoparticles (both interband and intraband transitions contributed), we separated the two components of . (2) Geometry factors: The investigation of Ag nanoparticles with different sizes and Au nanoparticles with different shapes results that is strongly influenced by geometry factors. The quantum size effect and local filed effect are discussed and compared. (3) Broadband SPR response of TiN: Traditional plasmonic materials suffer from low optical thresholds that limit their usages. Titanium nitride has shown superior properties such as thermal stability, low cost and CMOS-compatible fabrication process. We experimentally obtained of TiN thin film and nanoparticles in an unprecedented wide bandwidth range with a broadband response.