Silicon Inverse opal band structure

Hi everybody,

I have been trying to simulate the band structure for an 3D inverse opal of
silicon with eps ~ 12.25. I have defined two concentric spheres one of
radius 'a' and dielectric 1  at (0 0 0) and the other of radius 'b'
(slightly smaller than a) at position (0 0 0) with dielectric 2. I am not
sure how to write the code for the windows interconnecting the hollow sphere
cavities. This can have large implications of the band structure for the
material as new stop bands open for frequencies above that of the first
pseudo PBG (gamma-L)

Does anyone know to write the script to model these interconnecting windows?

Any help would be greatly appreciated.

Regards,

Vedran

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