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Recent content by Grizzly101

  1. Grizzly101

    Finite Difference Optical Waveguide Mode Solver

    Thanks GOTWW, As it turned out my discretisation was fine, it was how I was getting the eigenvalues. I was looking for the 3 eigenvalues that were largest in magnitude. This was fine when the main diagonal was positive but when xstep was reduced further it went negative, the eigenvalues I was...
  2. Grizzly101

    Finite Difference Optical Waveguide Mode Solver

    When solving the eigenvalue problem [A]*E =(beta^2/k0^2)*E, where beta is the prop constant, E the electric field and k0 the free space wavenumber: Is there a limit on how small a discretisation step size you can take? In my matrix [A] the main diagonal for a 2-D mesh is constructed by the...
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