A question about FDTD simulation time


    • Zhang Huiyu

      My example is a surface plasmon metamaterial absorber. During my simulation, if the simulation time is set slightly larger than the propagation distance /c*index, the simulation results are normal. However, when the time is increased to a larger amount, the numerical changes of the reflectance and refractive index will be very large, like the situation of noise. At this time, R+T> will appear at some wavelengths. 1 case. I found some information that the simulation time is too short, the result is not accurate, it needs to increase the simulation time, if the simulation time is too long, will it have an impact?

    • Guilin Sun
      Ansys Employee

      I am not sure how the refractive index also changes with simulation time.

      In general, you will need the simulation run long enough to reach the preset autoshutoff min, which by fault is 1e-5. If the result is suspicious you may need to reduce it further. Please refer this post

      Ansys Insight: 透射率反射率大于1,或者透射率反射率之和大于1的原因与解决方案综合贴


      R+T >1 can be due to a number of reasons:

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