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
Jonathan Andreasen and Miroslav Kolesik, "Core-Confined Beam Propagation Method for Guiding and Leaky Structures," J. Lightwave Technol. 31, 2999-3005 (2013)