Abstract
AbstractA wide‐band finite‐difference–time‐domain beam propagation method (FD TD‐BPM) based on Padé approximants is introduced to improve the bandwidth of the conventional TD‐BPM. Numerical dispersion relations for the TD‐BPM are derived to demonstrate the increase in bandwidth of the wide‐band TD‐BPM. The effects of the spatial and time step sizes on the numerical dispersion are also investigated. It is shown that the wide‐band TD‐BPM is less sensitive to the choice of spatial step size and allows a larger time step size to be used compared to the finite‐difference time‐domain (FD‐TD) method. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 34: 243–247, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10428
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