2 September 2016 Theoretical analysis of slab waveguides supporting SPP modes toward their sensitivity characteristics
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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 dm=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.
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Cuma Tyszkiewicz, 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); doi: 10.1117/12.2244585; https://doi.org/10.1117/12.2244585
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