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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › Diverging simulation when going from long to short wavelength › Reply To: Diverging simulation when going from long to short wavelength

February 9, 2024 at 5:07 pm
Daniel Marchant
Subscriber

Hi Anita, thank you for your quick reply.This is a single wavelength simulation (simulation bandwidth of 0.3 um which is the standard set by Lumerical FDTD, I also tried reducing this to 0.1 um but that did not resolve the issue). The materials used are Silicon Nitride (for the waveguide) and silicon dioxide (for the cladding).

I think you may be correct about the issue being related to the material fitting, but I am not sure exactly how this is causing the issue. As I mentioned, the simulation runs fine for a longer wavelength and I use similar values for the fit tolerance, number of fitting coefficients and the fitting range. 

I have attached some images from the movie monitor that show the issue.

Kind regards,

Daniel

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