Photonics

Photonics

Convergence issues for FDTD simulation of plasmonic gold nanowire

    • Chris Kopetski
      Ansys Employee

      I am trying to get the plasmonic modes on a gold nanowire placed over a gold thin film. The results are not converging and the auto shut off level is not decreasing.Question migrated from the Lumerical Knowledge Exchange.

    • Chris Kopetski
      Ansys Employee

      The FDTD convergence testing page is the best place to find tips and methodology to help with convergence testing. A few specific suggestions:

      • The simulation volume is larger than it needs to be. Just include about 1/2 a wavelength of space around the edge of the structure
      • Start by using a larger mesh so the simulation runs faster
      • Add a movie monitor so you can see where the instability in the fields comes from
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