Method of Fundamental Solutions for Maxwell's Equations in Bi-Periodic Multilayered Media
This work provides a promising approach for fast and accurate boundary integral equation solvers in electromagnetics and optics, particularly for applications involving a large number of layers.
The paper presents a numerical method for solving Maxwell's equations in bi-periodic multilayered media using the Method of Fundamental Solutions with a periodization scheme, achieving exponential convergence close to $10^{-14}$ for single and multiple interfaces, and demonstrating the solver's performance on a 39-interface example.
In this paper, we present an accurate numerical method for the time-harmonic Maxwell's equations for bi-periodic multilayered media with quasi-periodic incident waves using the Method of Fundamental Solutions in conjunction with a periodization scheme. Following an approach used in acoustic scattering problems, the electric and magnetic fields in each layer are expressed as a sum of near and distant interactions. The near interaction comprises interactions between the unit cell and its nearest neighboring copies, while the distant interaction is approximated by proxy source points placed on spheres surrounding the unit cell. Imposing continuity of tangential components at the layer interface, quasi-periodicity conditions on the walls of the unit cell, and Rayleigh-Bloch expansion for the radiation condition yields a system of equations for the unknown coefficients, which can be solved by Schur complement and a backward-stable solver. The scheme is verified with known solutions and exhibits exponential convergence close to $10^{-14}$ for both single and multiple interfaces. An example with 39 interfaces is presented to demonstrate the solver's performance. The paper provides promising results for extending this method to a fast and accurate boundary integral equation solver for many cutting-edge applications involving a large number of layers in electromagnetics and optics.