Photonics

Photonics

Creating 2D Conductivity from Permittivity Data

    • Taylor Robertson
      Ansys Employee

      In order to speed up the simulation, very thin metals can be considered a 2D sheet, and use surface conductivity. This example shows how to convert permittivity data to conductivity data which can be used by 2D rectangles and 2D polygon objects.

      Background

      When thickness of the metal layers is much smaller than the wavelength of light, we can represent the metal as a 2D structure with a specified bulk conductivity and thickness. The sampled 2D data material model can be used.

      The advantage of this is that compared to using a 3D rectangle object with a specified permittivity, we can use a coarser mesh compared to the 3D rectangle where it would be necessary to set the mesh to be fine enough to includes at least 2 mesh cells over the layer thickness to resolve the layer thickness. Using a coarser mesh can significantly speed up the simulation running time and reduce memory requirements.

      Example

      The following script file takes existing sampled 3D data for the permittivity of gold from the “Au (Gold) – CRC” material in the material database and calculates the equivalent bulk conductivity using the formula:

    • demirdjian
      Subscriber

      Dear Mister,

      what are the different variables in this formula ? Where this formula comes from ?

      Thanks in advance. With my best regards.

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