Cho, S. Lee, K.-S. 2024-01-20T20:05:29Z 2024-01-20T20:05:29Z 2021-09-02 2009-12 1225-0562 https://pubs.kist.re.kr/handle/201004/131946 In this study, we analyzed the effect of silicon oxynitride matrix on the optical properties of Au nanoparticles dispersed on composite film and explored the effectiveness of the silicon in fine tuning the refractive index of the composite film for applications in optical waveguide devices. The atomic fraction of nitrogen in SiOxNy films was controlled by varying the relative flow ratio of nitrogen gas in reactive sputtering and was evaluated optically using an effective medium theory with Bruggeman geometry consisting of a random mixture between SiO2 and Si3N4. The Au nanoparticles were embedded in the SiOxNy matrix by employing the alternating deposition technique and clearly showed an absorption peak due to the excitation of surface plasmon. With increasing nitrogen atomic fraction in the matrix, the surface plasmon resonance wavelength shifted to a longer wavelength (a red-shift) with an enhanced resonance absorption. These characteristics were interpreted using the Maxwell-Garnett effective medium theory. The formation of a guided mode in a slab waveguide consisting of 3 μm thick Au:SiOxNy nanocomposite film was confirmed at the telecommunication wavelength of 1550 nm by prism coupler method and compared with the case of using SiO2 matrix. The use of SiOxNy matrix provides an effective way of controlling the mode confinement while maintaining or even enhancing the surface plasmon resonance properties. Korean Effective medium theories Effective medium theory matrix Silicon oxynitrides Composite films Gas absorption Gold Metallic matrix composites Nanocomposites Nanoparticles Nitrogen Optical waveguides Plasmons Refractive index Silicon nitride Silicon oxides Surface plasmon resonance Waveguides Optical films Effect of silicon oxynitride matrix on the optical properties of Au nanoparticles dispersed composite film Article 10.3740/MRSK.2009.19.12.637 1 Korean Journal of Materials Research, v.19, no.12, pp.637 - 643 Korean Journal of Materials Research 19 12 637 643 scopus kci ART001398077 2-s2.0-77953896198 Article Effective medium theories Effective medium theory matrix Silicon oxynitrides Composite films Gas absorption Gold Metallic matrix composites Nanocomposites Nanoparticles Nitrogen Optical waveguides Plasmons Refractive index Silicon nitride Silicon oxides Surface plasmon resonance Waveguides Optical films Effective medium theory Metal-dielectric nanocomposite Silicon oxynitride matrix Surface plasmon resonance