Year: 2011
Communications in Computational Physics, Vol. 9 (2011), Iss. 1 : pp. 113–128
Abstract
In a two-dimensional (2D) photonic crystal (PhC) composed of circular cylinders (dielectric rods or air holes) on a square or triangular lattice, various PhC devices can be created by removing or modifying some cylinders. Most existing numerical methods for PhC devices give rise to large sparse or smaller but dense linear systems, all of which are expensive to solve if the device is large. In a previous work [Z. Hu et al., Optics Express, 16 (2008), 17383-17399], an efficient Dirichlet-to-Neumann (DtN) map method was developed for general 2D PhC devices with an infinite background PhC to take full advantage of the underlying lattice structure. The DtN map of a unit cell is an operator that maps the wave field to its normal derivative on the cell boundary and it allows one to avoid computing the wave field in the interior of the unit cell. In this paper, we extend the DtN map method to PhC devices with a finite background PhC. Since there is no bandgap effect to confine the light in a finite PhC, a different technique for truncating the domain is needed. We enclose the finite structure with a layer of empty boundary and corner unit cells, and approximate the DtN maps of these cells based on expanding the scattered wave in outgoing plane waves. Our method gives rise to a relatively small and sparse linear systems that are particularly easy to solve.
You do not have full access to this article.
Already a Subscriber? Sign in as an individual or via your institution
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/cicp.250909.230410a
Communications in Computational Physics, Vol. 9 (2011), Iss. 1 : pp. 113–128
Published online: 2011-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 16
-
Transparent Boundary Conditions for Evolution Equations in Infinite Periodic Strips
Coatléven, Julien
SIAM Journal on Scientific Computing, Vol. 34 (2012), Iss. 3 P.A1563
https://doi.org/10.1137/110838030 [Citations: 1] -
A radiation box domain truncation scheme for the wave equation
Schweizer, B | Schäffner, M | Tjandrawidjaja, YIMA Journal of Numerical Analysis, Vol. 44 (2024), Iss. 2 P.920
https://doi.org/10.1093/imanum/drad027 [Citations: 0] -
Helmholtz equation in periodic media with a line defect
Coatléven, Julien
Journal of Computational Physics, Vol. 231 (2012), Iss. 4 P.1675
https://doi.org/10.1016/j.jcp.2011.10.022 [Citations: 20] -
Improved Dirichlet-to-Neumann map method for scattering by circular cylinders on a lattice
She, Shichang | Lu, Ya YanJournal of the Optical Society of America A, Vol. 29 (2012), Iss. 9 P.1999
https://doi.org/10.1364/JOSAA.29.001999 [Citations: 2]