We propose a transparent boundary for the finite-element beam-propagation method to analyze the beam propagation in a finite computational window. In this method, a transparent boundary condition is derived by assuming a beam to be a plane wave in the vicinity of a virtual boundary, which eliminates undesirable reflections from a virtual boundary.
© 1993 Optical Society of America
Yasuyuki Arai, Akihiro Maruta, and Masanori Matsuhara, "Transparent boundary for the finite-element beam-propagation method," Opt. Lett. 18, 765-766 (1993)