Photonics

Photonics

Material with frequency-dependent anisotropic permittivity in Lumerical

    • andrewcaratenuto
      Subscriber

      Hi, I am trying to simulate a material with a frequency-dependent non-diagonal permittivity matrix in Lumerical.

      I found this link (https://support.lumerical.com/hc/en-us/articles/360034915173) which gives instructions on how to create a material with a non-diagonal permittivity using a transformation matrix, but this is only for constant permittivity values.

      I also found this link (https://support.lumerical.com/hc/en-us/articles/360034901993) for importing spatially-varying non-diagonal n & k values, but this is not exactly what I need. My values will not vary spatially; they will only vary with frequency.

      Any support would be greatly appreciated. Thank you.

    • Greg Baethge
      Ansys Employee

      Thank you for posting your question on the forum. I'm not too sure it will be possible to do this. The issue is, if FDTD supports dispersive diagonal anisotropic material, I don't think it is the case for the matrix transformation.
      What you can try is to diagonalize the tensor for each frequency point and check the resulting unitary matrix. If the unitary matrix doesn't vary much with the frequency, you can create a new material in the database, using the diagonal tensor values vs frequency (see Creating a new sampled data material) and use the matrix transformation grid attribute with, for example, an average of the unitary matrix over the frequency range.
    • andrewcaratenuto
      Subscriber
      thanks for your fast response. I had a feeling this might be the case, so it is good to get confirmation. I'll give this a shot.
    • Greg Baethge
      Ansys Employee
      You're very welcome,
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