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For both generalized and normal eigen value problems, just a few band-index plots in the band-structure diagrams are required, usually lying on the [[brillouin zone edges]]. This corresponds to eigen modes solutions using iterative techniques, as opposed to diagonalization of the entire matrix.
The PWEM is highly efficient for calculating modes in periodic dielectric structures. Being a Fourier space method, it suffers from
==Disadvantages==
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