Coupled-dipole approximation for high permittivity materials

We show that it is possible to strongly increase the performance of the coupled-dipole approximation (CDA) using together two modifications of the scheme recently developed: the filtered coupled-dipoles (FCD) and the weighted discretization (WD). Greatly improved accuracy of the results is archieved...

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Bibliographic Details
Published in:Optics communications 1999-02, Vol.160 (1), p.10-14
Main Author: Piller, Nicolas B.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Wave optics
Wave propagation, transmission and absorption
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Summary:We show that it is possible to strongly increase the performance of the coupled-dipole approximation (CDA) using together two modifications of the scheme recently developed: the filtered coupled-dipoles (FCD) and the weighted discretization (WD). Greatly improved accuracy of the results is archieved, even for strong permittivity materials. Furthermore, the domain of permittivity where the method converges is strongly enlarged. Like this, absorbing scatterers or materials with high permittivity, like semiconductors or metals, can also be simulated with CDA. Finally, we show that FCD positively influences the condition of the system of equations, improving the convergence of the conjugate gradient algorithm, which strongly speeds up the factorization.
ISSN:0030-4018
1873-0310
DOI:10.1016/S0030-4018(98)00645-2