I have a basic simulation of a point source, a collimating lens, and a 45 degree plane. The plane is defined by a rectangular volume with a very small thickness. The light source consists of two wavelengths, 0.633 and 0.450 micrometers. I coat the Front of the rectangular volume with “HR_633_21L” -- a coating to strongly reflect 633 nm. The Back of the rectangular volume is coated with “400-700_4L”, which should pass the 450 nm light.
In the simulation, though, both sources seem to pass right through (shown in image). I cannot figure out why. Please help? What basic step am I missing?
