Waveguide-mode sensors with sculptured porous waveguide

Motofumi Suzuki; Munehito Takagaki; Shohei Kuriyama; Kaoru Nakajima; Kenji Kimura

doi:10.1117/12.2023631

19 September 2013 Waveguide-mode sensors with sculptured porous waveguide

Motofumi Suzuki, Munehito Takagaki, Shohei Kuriyama, Kaoru Nakajima, Kenji Kimura

Proceedings Volume 8818, Nanostructured Thin Films VI; 88180H (2013) https://doi.org/10.1117/12.2023631
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

We have investigated feasibility of waveguide-mode sensors, which is sensitized by a nanocolumnar SiO₂ waveguide layer deposited by an oblique angle deposition technique. Because the effective refractive index of nanocolumns and fluid composites (n₁) depends on that of fluid (n₂), sensitivity of the waveguide-mode sensors is expected to be improved. In fact, the resonant angle of incidence of the waveguide-mode sensors, which have various combinations of layer thicknesses, changes significantly depending on the analytes of air (n₂ = 1.00), H₂O (n₂ = 1.33) and C₂H₅OH (n₂ = 1.36). The effective refractive indices of the waveguide layer immersed in these fluid are estimated at 1.28 for air, 1.41 for H₂O and 1.42 for C₂H₅OH. The effective refractive index of the waveguide layer is understood by Bruggeman’s effective medium model. Therefore, the nanocolumnar waveguide layer is quite useful to improve sensitivity of the waveguide-mode sensors. In order to improve sensing sensitivity, more porous layer is desirable.

Citation Download Citation

Motofumi Suzuki, Munehito Takagaki, Shohei Kuriyama, Kaoru Nakajima, and Kenji Kimura "Waveguide-mode sensors with sculptured porous waveguide", Proc. SPIE 8818, Nanostructured Thin Films VI, 88180H (19 September 2013); https://doi.org/10.1117/12.2023631

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