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All-
When trying to fit the dispersive dielectric function of either Au or
a-Si (both from Palik), decent fits can be obtained, but one of the
delta-epsilon is negative.
Is this a problem? By looking at http://ab-initio.mit.edu/wiki/
index.php/Dielectric_materials_in_Meep#Material_dispersion it would
appear not. However, if I run Au spheres, I do observe an extra
absorption peak that doesn't occur when calculating with the Layered
KKR method (rest of the spectrum is fine). Also, if I use a different
metal (whose fit does not include a negative delta-epsilon) with the
same ctl file, the results agree with KKR (i.e. it's not a problem
with the ctl file).
Any comments would be appreciated.
gp
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