Performance Analysis of CPML for the Compact 2-D FDTD method in Cylindrical Coordinate System

Yasuo OHTERA  Haruka HIROSE  Hirohito YAMADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E97-C   No.7   pp.653-660
Publication Date: 2014/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.653
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Simulation Techniques and Their Applications for Electronics)
Category: 
Keyword: 
FDTD method,  Perfectly Matched Layer,  CPML,  microstructured fibers,  out-of-plane propagation,  

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Summary: 
Performance suveyrance of CPML (Convolutional PML) for FDTD (Finite-Difference Time-Domain) method in cylindrical coordinate system was carried out. The CPML was placed perpendicularly to the radial axis and designed to absorb diverging or converging waves. To be able to analyze microstructured optical fibers and disk/ring resonators we introduced finite axial wavenumbers into the FDTD formulation. We investigated the dependence of reflectivity upon CPML's constituteve parameters such as κ and σ for various curvature radii and the axial wavenumbers. As a result of evaluation we found that the reflectivity gradually increased togather with the increase of the wavenumber. We also confirmed that the absorption performance was of the similar order for the converging waves and the diverging ones provided that their curvature radii were the same.