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Optimal absorbing boundary conditions

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Abstract

We examine three simply implemented boundary conditions for finite-difference electric field propagation. We find that although so-called transparent boundary conditions are appropriate for highly collimated beams, properly tailored absorbers are generally better adapted to realistic field distributions. Our analysis incorporates a simple procedure for constructing nearly optimal absorber functions as well as a novel mixed transparent/absorbing boundary condition.

© 1995 Optical Society of America

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