Convergence issues for FDTD simulation of plasmonic gold nanowire

- April 21, 2021 at 11:37 pm
  
  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.
- April 21, 2021 at 11:48 pm
  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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