A new beam propagation method based on least-squares expansion approximating

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Abstract
A new finite difference wide-angle beam propagation method is developed by introducing the least-squares expansion approximant in the propagator expansion- In this new method it is not necessary to select the reference index point because of the whole region approaching the lease-square expansion- This method avoids the problems induced by error selection of the reference index in the old methods based on Taylor or Padè expansion- Several typical structures are simulated by the new method and the results prove the validity of it-

Keywords:
beam propagation method /

finite difference /

integrated optics /

numeric method
Authors and contacts
Xia Jin-Song,

Yu Jin-Zhong

1.
中国科学院半导体研究所,集成光电子国家重点实验室,北京 100083
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