Efficient scattering model of multi-layer systems with anisotropic films
Posted on 05.04.2021 - 20:29
We present an intuitive and very efficient method for modeling light propagation in layered isotropic and anisotropic media, the iterated ray method. Considering a single layer sandwiched between semi-infinite layers, the infinite reflected and transmitted rays are summed to obtain effective Fresnel coefficients for the center layer. Thus, the system can be represented as two semi-infinite layers with an effective boundary. The model is coupled to a recursive algorithm to describe an arbitrarily large, layered system in the same way. It is numerically stable in the presence of evanescent waves and is up to eighty times faster than the $S$-matrix method, making it an ideal tool for the optical analysis and optimization of layered media, e.g. those used in photo-addressable liquid crystal cells, but also film coatings and Bragg gratings. As an example application we have used it to measure the refractive index and thickness of a thin, azo-benzene dye, photo-alignment layer, PAAD-22E, on an ITO coated glass slide.
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Gill, Jordan; Perivolari, Elena; Kaczmarek, Malgosia; Alessandro, Giampaolo D (2021): Efficient scattering model of multi-layer systems with anisotropic films. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5348222.v2
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Giampaolo D Alessandro