When the eigenmode expansion method (EEM) is used in a continuously z-varying waveguide, the waveguide must be approximated by z-invariant segments. This leads to a second order error. We develop a fourth order EEM.
© 2005 Optical Society of America
Y. Y. Lu, " A Fourth Order Eigenmode Expansion Method for 2-D Wave-Guiding Structures," in Integrated Photonics Research and Applications/Nanophotonics for Information Systems, Technical Digest (Optical Society of America, 2005), paper IWC3.
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