Hey Everyone, I’m trying to model custom materials in meep by fitting Lorentz-Drude susceptibility parameters to provided n and k values. As a sanity check, I set up a simulation to measure the reflectivity of a given material, and I’m comparing this to the reflectivity as calculated using the Lorentz-Drude susceptibility profile given in the materials_library.py file. Using Aluminum as an example, I’m finding that the reflectivity in the meep simulation is higher than expected based on the given material parameters. The reflectivity calculation is consistent with other sources for the reflectivity of Aluminum, so I believe there must be a problem in the simulation. I would expect that calculating the reflectivity based on LD parameters and simulating a material with those same LD parameters would give the same answer. I’ve already checked that the simulation is using the intensity of the fields, so it isn’t a problem of squaring my simulated reflectivity values. If anyone knows what might be going on, I would really appreciate it.
Here's a sample of the reflectivity data I’ve collected: Wavelength (nm) - 500, 600, 700, 800, 850, 900, 1000 Calculated Reflectivity - 0.920, 0.911, 0.904, 0.871, 0.869, 0.895, 0.936 Simulated Reflectivity - 0.963, 0.959, 0.954, 0.936, 0.929, 0.941, 0.964 - - - - - - - - - - - - - - - - - - - - - Dylan McKeithen Jet Propulsion Laboratory
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