Re: [Meep-discuss] discrete epsilon data

[Ardavan Oskooi]

Currently, there is no direct way in Meep to load external dielectric 
data from a file (this topic has already come up a number of times in 
this mailing list). However, you can certainly write your own function 
to do so (in Scheme or C++, the latter being probably a little easier 
for file I/O). Remember that any arbitrary dielectric function can be 
incorporated into the Meep simulation using a customized material 
function where given a vector (corresponding to a location in the 
computational cell, taking note of the co-ordinate system and 
boundaries) as input, it returns the dielectric at that point (isotropic 
or anisotropic, both are possible). Thus, it is inside this function 
that you need to load your data from a file and map a given spatial 
vector to a (presumably interpolated) dielectric value in the data. To 
get a feeling for the syntax, I recommend you carefully study the suite 
of test files (found in the /meep/tests directory, written in C++).

AO
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