Test of the FDTD accuracy in the analysis of the scattering resonances associated with high-Q whispering-gallery modes of a circular cylinder

Authors :: Boriskin, A. V.
Boriskina, S. V.
Rolland, A.
Sauleau, R.
Nosich, A. I.
Source :: J. Opt. Soc. Am. A, vol. 25, no. 5, pp. 1169-1173, 2008
Publication Year :: 2010
Abstract: The objective of the paper is the assessment of the accuracy of a conventional FDTD code in the computation of the near and far-field scattering characteristics of a circular dielectric cylinder. We excite the cylinder with an electric or magnetic line current and demonstrate the failure of the two-dimensional FDTD algorithm to characterize accurately the emission rate and the field patterns near high-Q whispering-gallery-mode resonances. This is proven by comparison with the exact series solutions. The computational errors in the emission rate are then studied at the resonances still detectable with FDTD, i.e. having Q-factors up to 10^3.<br />Comment: 5 pages, 6 figures

Subjects :: Physics - Optics
Physics - Classical Physics
Physics - Computational Physics

Full Text Access

Tools