This code reproduces the figures from
"Plasmonic sensors beyond the phase matching condition: a simplified approach"
By Alessandro Tuniz, Alex Y. Song, Giuseppe Della Valle, and C. Martijn de Sterke
Sensors 22(24), 9994 (2022) https://doi.org/10.3390/s22249994
For research purposes only.
Please cite the above paper if using any portion of this code for your research.
Creative Commons License (LICENSE-CC-BY-NC-SA).
Written by Alessandro Tuniz
main.ipynb can be run in its entirety to reproduce all figures in the paper
examples/load_modes_plot_transmission.ipynb allows you to load relevant effective index tables and obtain the transmission through a device of length L
Paper Abstract:
The conventional approach to optimising plasmonic sensors is typically based
entirely on ensuring phase matching between the excitation wave and the surface
plasmon between two semi-infinite media. However, this leads to suboptimal
performance, even in the conventional Otto geometry. We present a simplified
coupled mode theory approach for evaluating and optimizing the sensing properties
of plasmonic waveguide refractive index sensors. It only requires the calculation
of propagation constants, without the need for calculating overlap integrals.
We apply out method by evaluating the wavelength-, device length- and
refractive index-dependent transmission spectra for an example silicon-on-insulator-based
sensor of finite length. This reveals all salient spectral features which are
consistent with full-field finite element calculations. This work provides a
rapid and convenient framework for designing dielectric-plasmonic sensor prototypes.