Adaptive perfectly matched layer for Wood's anomalies in diffraction gratings

2015/06/20 by Benjamin Vial, Vial, Benjamin, Frédric Zolla +7
Engineering · Materials Science · Physics and Astronomy · #Electromagnetic Scattering and Analysis #Electromagnetic Simulation and Numerical Methods #FOS: Physical sciences #Optical Coatings and Gratings #Optics (physics.optics)

paper · doi:10.48550/arxiv.1506.06254

openalex publication_date 2015/06/20 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28

Abstract

We propose an Adaptive Perfectly Matched Layer (APML) to be used in diffraction grating modeling. With a properly tailored co-ordinate stretching depending both on the incident field and on grating parameters, the APML may efficiently absorb diffracted orders near grazing angles (the so-called Wood's anomalies). The new design is implemented in a finite element method (FEM) scheme and applied on a numerical example of a dielectric slit grating. Its performances are compared with classical PML with constant stretching coefficient.

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