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arXiv · 2203.05795

A High-Order-Accurate 3D Surface Integral Equation Solver for Uniaxial Anisotropic Media

Jin Hu·Constantine Sideris
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Abstract

This paper introduces a high-order accurate surface integral equation method for solving 3D electromagnetic scattering for dielectric objects with uniaxially anisotropic permittivity tensors. The N-M\"uller formulation is leveraged resulting in a second-kind integral formulation, and a finite-difference-based approach is used to deal with the strongly singular terms resulting from the dyadic Green's functions for uniaxially anisotropic media while maintaining the high-order accuracy of the discretization strategy. The integral operators are discretized via a Nystr\"om-collocation approach, which represents the unknown surface densities in terms of Chebyshev polynomials on curvilinear quadrilateral surface patches. The convergence is investigated for various geometries, including a sphere, cube, a complicated NURBS geometry imported from a 3D CAD modeler software, and a nanophotonic silicon waveguide, and results are compared against a commercial finite element solver. To the best of our knowledge, this is the first demonstration of high-order accuracy for objects with uniaxially anisotropic materials using surface integral equations.

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Jin Hu, Constantine Sideris. 2022-03-11. A High-Order-Accurate 3D Surface Integral Equation Solver for Uniaxial Anisotropic Media. https://doi.org/10.1109/tap.2023.3246084

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