P. J. Chiang,P. J. ChiangN. H. Sun,N. H. SunH. C. ChangHUNG-CHUN CHANG2018-09-102018-09-102008-07http://scholars.lib.ntu.edu.tw/handle/123456789/342525Using the Penalty Method for Imposing Boundary Conditions in the Pseudospectral Optical Waveguide Mode Solverconference paper10.1364/ipnra.2008.itud5