@article{
 title = {Modeling open nanophotonic systems using the Fourier modal method: generalization to 3D Cartesian coordinates},
 type = {article},
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 id = {57909ab4-4f09-33c6-b025-57f45c38e2a3},
 created = {2017-10-03T13:15:30.074Z},
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 profile_id = {1ce0d6a7-1696-3148-b43d-7d98fc1661a8},
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 authored = {false},
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 abstract = {Recently, an open geometry Fourier modal method based on a new combination of an open boundary condition and a non-uniform k-space discretization was introduced for rotationally symmetric structures, providing a more effi-cient approach for modeling nanowires and micropillar cavities [J. Opt. Soc. Am. A 33, 1298 (2016)]. Here, we generalize the approach to three-dimensional (3D) Cartesian coordinates, allowing for the modeling of rectangular geometries in open space. The open boundary condition is a consequence of having an infinite computational do-main described using basis functions that expand the whole space. The strength of the method lies in discretizing the Fourier integrals using a non-uniform circular " dartboard " sampling of the Fourier k space. We show that our sampling technique leads to a more accurate description of the continuum of the radiation modes that leak out from the structure. We also compare our approach to conventional discretization with direct and inverse factorization rules commonly used in established Fourier modal methods. We apply our method to a variety of optical waveguide structures and demonstrate that the method leads to a significantly improved convergence, en-abling more accurate and efficient modeling of open 3D nanophotonic structures. OCIS codes: (050.1755) Computational electromagnetic methods; (350.3950) Micro-optics; (230.7370) Waveguides; (000.3860) Mathematical methods in physics; (000.4430) Numerical approximation and analysis.},
 bibtype = {article},
 author = {Häyrynen, Teppo and Dyhl Osterkryger, Andreas and Rosenkrantz, Jakob and Lasson, De and Gregersen, Niels}
}

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Opt. Soc. Am. A 33, 1298 (2016)]. Here, we generalize the approach to three-dimensional (3D) Cartesian coordinates, allowing for the modeling of rectangular geometries in open space. The open boundary condition is a consequence of having an infinite computational do-main described using basis functions that expand the whole space. The strength of the method lies in discretizing the Fourier integrals using a non-uniform circular \" dartboard \" sampling of the Fourier k space. We show that our sampling technique leads to a more accurate description of the continuum of the radiation modes that leak out from the structure. We also compare our approach to conventional discretization with direct and inverse factorization rules commonly used in established Fourier modal methods. We apply our method to a variety of optical waveguide structures and demonstrate that the method leads to a significantly improved convergence, en-abling more accurate and efficient modeling of open 3D nanophotonic structures. 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