COMPUTATION OF RESONANT MODES OF OPEN RESONATORS USING THE FEM AND THE ANISOTROPIC PERFECTLY MATCHED LAYER BOUNDARY-CONDITION

A finite-element approach for the eigenmode analysis of open resonator s is presented using a perfectly matched layer (PML) absorbing boundar y condition. The PML is a nonphysical anisotropic lossy material absor bing outgoing waves from the computational domain. The validity of the approach is examined via the application to a Fabry-Perot resonator p roblem. Numerical error analyses for the quality factors and resonant frequencies demonstrate the accuracy and reliability of the anisotropi c PML method applied to the eigenvalue problem. (C) 1997 John Wiley & Sons, Inc.