Abstract
A new beam propagation method (BPM) is developed based on a direct approximation
to the propagator by its Padé approximant. The approximant is simple to construct
and has the desired damping effect for the evanescent modes. The method is
applied to a tapered waveguide for TM-polarized waves, based on the energy-conserving
improvement of the one-way Helmholtz equation. Numerical results are compared
with those obtained with other variants of the BPM.
© 2002 Optical Society of America
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