Gaussian beam scattering from a dielectric cylinder, including the evanescent region.
The scattering of a two-dimensional Gaussian beam from a homogeneous dielectric cylinder is analyzed using a plane-wave spectrum. Special attention is given to the computation of the evanescent field of the beam and its effect in the scattering. A comparison is made between the evanescent field in Cartesian coordinates and in cylindrical coordinates as a sum of cylindrical waves. The field given by the cylindrical wave equation is found to converge spatially as we include more Bessel modes. The evanescent field incident on the dielectric cylinder is found to cause radiating waves to form and propagate outward.
Pawliuk
Peter
P
Department of Electrical and Computer Engineering, The University of British Columbia, 2329 West Mall, Vancouver, British Columbia, Canada V6T 1Z4. ppawliuk@interchange.ubc.ca
Yedlin
Matthew
M