I'm looking for references about photons in crystals, particularly

- experiments on decay in diffusion, possibly with public data.
- their
**quantum analyses** and computation models.

I have a classical model: a photon goes through n potential barriers of height h, where n is bounded by a function depending on the crystal elementary alignment and h is the barriers common height, 2 emergent variables that are not directly measurable. Moreover, their analytical computation, from less emergent variables, needs unwanted assumptions and serious simplifications. Finally, the model allows only to compute quickly n and h to fit the remaining data with the newly predicted curve. Any better solution that can be applied numerically interests me.

TY