Abstract
We propose a beam propagation method variant, which only requires the computational grid to span the
core region of a waveguiding structure. Optical fields outside are accounted for through semitransparent boundary
conditions. The method is fast, simple to implement, and accurate over a wide range of wavelengths. It is applicable
to both guiding and leaky structures, with sufficiently strong contrast between refractive indices in the core,
substrate, and cladding.
© 2013 IEEE
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