|Message: What is the right way to implement anisotropic optical properties in Geant4?||Not Logged In (login)|
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I have a crystal shaped as a parallelepiped whose refractive index has 3 different values along each of the reference frame axes. My approach was to divide the parallelepiped into 6 pyramids with a common tip in the center of the parallelepiped, with different refractive indices. However, I do have problems in the bulk as I have internal surfaces between different optical materials (different refractive index). I am not sure how to define an optical surface which allows photons to go from one pyramid to another without taking into account the optical processes (reflection, refraction etc.) at that particular interface. I know Detect2000 has a so called PSEUDO optical surface which does exactly what I try to achieve and I was hoping that surface was implemented in Geant4 as well in the Unified model. So what to implement, or better what not to implement, for an optical surface so it is optically permeable but has no optical properties?
I hope there is a more elegant way of implementing optical anisotropy, i.e. something like a refractive index tensor because I am not happy with my solution. Needless to say that the bulk absorption is also anisotropic and I have no clue what to do about that.
Thank you for your help.
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