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Proceedings Paper

Simulating particle influence on silicon nitride strip waveguide single-mode parameters
Author(s): Marcus Baumgart; Jaka Pribošek; Anton Buchberger; Anderson Singulani; Andreas Tortschanoff
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Paper Abstract

Detecting and classifying particles over a wide range of types and sizes is essential for precise air quality determination. In this study the use of optical waveguide-based particle detection is examined using finite element method (FEM) based simulations. The simulation model assumes a silicon nitride strip waveguide and is built up in 3D using the Comsol Multiphysics platform. The waveguide geometry parameters were varied to identify suitable geometries for single-mode wave guidance of the fundamental quasi-TE and quasi-TM modes. The geometries with their according effective wave indices are reported. Furthermore, the intensity and phase changes of the single-mode wave introduced by the presence of a particle are analyzed und the underlying physical effects are discussed for spherical particles of radii from 50 to 500 nm. The results show non-linear and non-monotonic behavior and give substantial input to understand basic particle interaction with waveguide structures. Furthermore, they provide helpful knowledge for designing waveguide-based particle detectors.

Paper Details

Date Published: 3 October 2019
PDF: 10 pages
Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 1120726 (3 October 2019); doi: 10.1117/12.2528122
Show Author Affiliations
Marcus Baumgart, CTR Carinthian Tech Research AG (Austria)
Jaka Pribošek, CTR Carinthian Tech Research AG (Austria)
Anton Buchberger, Technical Univ. of Graz (Austria)
Anderson Singulani, ams AG (Austria)
Andreas Tortschanoff, CTR Carinthian Tech Research AG (Austria)

Published in SPIE Proceedings Vol. 11207:
Fourth International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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