Hello MEEP Users and Steven,
I've expanded on the code in the the Opal Transmission example (writen
in C++) on the MEEP website to calculate the transmission for a 3D opal
mulitlayer. The spectra normalizes to values between 0 and 1 as it should.
However, I just realized that my src and flux planes lie outside the
computational cell, as I forgot to divide sz (cell dimension normal to the
film surface) by 2! When I code the same implementation in Scheme,
remembering to keep my src and flux planes in the cell, I get transmission
values greater than 1. Both my src and flux planes (in Scheme
implementation) are about 3 wavelengths (wrt largest wavelength in my
spectrum) away from the film. I tried increasing their distances from the
film, but there are still values greater than 1 in the spectrum.
My question is: is it problematic to have the src and flux planes
outside of the computation cell? I'm working with periodic boundary
conditions in all directions. I know one should leave sufficient distance
between one's structure and the src and flux planes, but must one do this
while still keeping the planes in the computational cell (i.e. just making
the computational cell larger versus give the planes coodinates outside the
computational cell region)? Hope what I'm trying to explain is clear.
Thanks,
Ian
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