Theoretical analysis of slab waveguides supporting SPP modes toward their sensitivity characteristics

Cuma Tyszkiewicz

doi:10.1117/12.2244585

2 September 2016 Theoretical analysis of slab waveguides supporting SPP modes toward their sensitivity characteristics

Cuma Tyszkiewicz

Proceedings Volume 10034, 11th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods; 100340I (2016) https://doi.org/10.1117/12.2244585
Event: 11th Integrated Optics - Sensors, Sensing Structures and Methods, 2016, Szczyrk, Poland

Abstract

This work is devoted to studying the dielectric/metal multilayer planar waveguide structure that is composed of a highrefractive index, single mode, silica-titania film deposited on a BK7 glass substrate. The waveguide film is loaded with a thin gold film, through a thin silica film. It is assumed that a semi-infinitive cover have the same refractive index as the water. There are presented and analyzed spectral characteristics of effective indexes of TM-polarized: dielectric and surface plasmon polariton (SPP) modes. Analysis of these characteristics is aimed at finding conditions for exciting the dielectric TM₀ mode and two SPP modes: antisymmetric and symmetric. Assuming that excitation is done with a field distribution of the unloaded TM₀ mode carried in this structure if the gold film is not present. The analysis is carried for the gold film having thicknesses d_m=50 nm. It is shown, that conditions for matching effective indexes of the unloaded TM₀ mode and SPP modes are met in a broad range of silica film thickness. The presence of the silica film is indispensable for reduction of a refractive index difference between loaded and unloaded TM₀ modes. It is shown that a sensitivity of this structure toward a small change of the cover refractive index is inconsiderably dependent on silica film thickness for the antisymmetric SPP mode. On the contrary, a sensitivity of the symmetric SPP mode, whose refractive index undergoes a discontinuous change with respect to wavelength changes its sign in function of the buffer film thickness.

Citation Download Citation

Cuma Tyszkiewicz "Theoretical analysis of slab waveguides supporting SPP modes toward their sensitivity characteristics", Proc. SPIE 10034, 11th Conference on Integrated Optics: Sensors, Sensing Structures, and Methods, 100340I (2 September 2016); https://doi.org/10.1117/12.2244585

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KEYWORDS

Silica

Dielectrics

Refractive index

Waveguides

Signal attenuation

Gold

Transducers

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