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Study of a Broadband Difference Interferometer Based on Low-Cost Polymer Slab Waveguides

Department of Optoelectronics, Faculty of Electrical Engineering, Silesian University of Technology, 2 Krzywoustego Str., 44-100 Gliwice, Poland
Nanomaterials 2019, 9(5), 729; https://doi.org/10.3390/nano9050729
Received: 20 March 2019 / Revised: 24 April 2019 / Accepted: 6 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Nanoscale Optical Sensing)
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Abstract

A model and the waveguide parameters of a broadband, polymer-based slab waveguide difference interferometer is presented in this paper. The parameters were determined based on knowledge of the dispersion in the structure materials used to fabricate the waveguide. The impact of the waveguide layer thickness, propagation path length, and change in the waveguide cover refractive index on the output signal from the system was determined. It has been shown that the direction of the maximum shifting is determined by the thickness of the waveguide layer. A relationship describing the shift in the signal extrema for a change in the waveguide cover refractive index was derived. The results show that the use of a propagation constant simplifies the description of the interferometer. Polymer waveguides, although they have a small contrast in refractive indices, allow for large shifts in the maxima of the signal. The determined shifts in the output signal extrema for polymer waveguides are comparable, and these shifts are larger for some waveguide thicknesses compared to waveguides based on Si3N4. View Full-Text
Keywords: interferometer; single-mode optical waveguide, sensor, polymer waveguide interferometer; single-mode optical waveguide, sensor, polymer waveguide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gut, K. Study of a Broadband Difference Interferometer Based on Low-Cost Polymer Slab Waveguides. Nanomaterials 2019, 9, 729.

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