I got a lot of elements in Material Browser of Comsol Multiphysics of Optics section. Unfortunately, all data looks identical and similar to stub.

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Each element has the same expression, which can be seen on screenshot.

How this should be used?


1 Answer 1


I don't see anything unusual here. You have a material property that is defined in terms of other material properties.

In your particular case, the real and imaginary parts of the refractive index are functions defined from n_interp and k_interp, which usually denote the interpolated values (either supplied by COMSOL or user-supplied). In many simulations, you might need the refractive index to be a continuous (and maybe even differentiable function); thus, some modeling from a discrete material properties data is needed. The underlying sampled data (n_interp and k_interp) is likely different and comes from different sources for different materials.

Moreover, I would assume, that for some materials+data combinations, the actual functional dependence might be slightly different (in additiona to the differences in the sampled properties before interpolation); however, that is an educated guess based on properties (other than the refractive index) that I had past experience in.

Now, you might be interested in how to set up your own refractive index properties, and there are several things you can do:

  • supply your own sampled data (this might be not a bad example)
  • change the expression of how you calculate the refractive index, which might be useful if you are investigating some custom materials' models or metamaterials.

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