2019年第80回応用物理学会秋季学術講演会

講演情報

一般セッション(口頭講演)

4 JSAP-OSA Joint Symposia 2019 » 4.6 Quantum Optics and Nonlinear Optics

[21a-E214-1~9] 4.6 Quantum Optics and Nonlinear Optics

2019年9月21日(土) 09:00 〜 11:45 E214 (E214)

尾松 孝茂(千葉大)、平野 琢也(学習院大)

11:30 〜 11:45

[21a-E214-9] Experimental Investigation of Third-order Susceptibility: Effect of Geometries and Materials

〇(D)Boyi Zhang1,2、Rodrigo Sato2、Mykhailo Chundak2、Satoshi Ishii2、Masato Ohnuma3、Masanobu Naito2、Michiko Yoshitake2、Joel Henzie2、Yoshihiko Takeda1,2 (1.Univ. of Tsukuba、2.NIMS、3.Hokkaido Univ.)

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.