stackpurcell -- why is there a very large radiated power loss when comparing emission into air?
Hi, Is there a resource explaining the differences in calculating the "result.density.downward" and "result.density.downward_into_air" fields of the output of the stackpurcell solver in Lumerical FDTD?
I am comparing the results from the example application: "optimizing farfield emission of multilayer stack". When I compare radiated power density (result.density.downward versus result.density.downward_into_air) I find a HUGE power drop, even at normal incidence! According to the fresnel equations, only ~4% of power should be directly reflected for normally incident light at an air-glass interface, while the simulations predict ~60% power loss.