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2004: Finite-Difference Time Domain Solution of Light Scattering by an Infinite Dielectric Column Immersed in an Absorbing MediumThe two-dimensional (2-D) finite-difference time domain (FDTD) method is applied to calculate light scattering and absorption by an arbitrarily shaped infinite column embedded in an absorbing dielectric medium. A uniaxial perfectly matched layer (UPML) absorbing boundary condition (ABC) is used to truncate the computational domain. The single-scattering properties of the infinite column embedded in the absorbing medium, including scattering phase functions, extinction and absorption efficiencies, are derived using an area integration of the internal field. An exact solution for light scattering and absorption by a circular cylinder in an absorbing medium is used to examine the accuracy of the 2-D UPML FDTD code. With use of a cell size of 1/120 incident wavelength in the FDTD calculations, the errors in the extinction and absorption efficiencies and asymmetry factors from the 2-D UPML FDTD are generally smaller than approx .1%. The errors in the scattering phase functions are typically smaller than approx .4%. Using the 2-D UPML FDTD technique, light scattering and absorption by long noncircular columns embedded in absorbing media can be accurately solved.
Document ID
20050041675
Acquisition Source
Headquarters
Document Type
Preprint (Draft being sent to journal)
Authors
Sun, W.
Loeb, N. G.
Tanev, S.
Videen, G.
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Optics
Funding Number(s)
CONTRACT_GRANT: NAG1-2318
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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