Inputting dielectric contant about mpb HOT 2 CLOSED

(set! geometry-lattice (make lattice (size 30 20 no-size)))   
(set! default-material (make dielectric (epsilon 12)))  

this code in Scheme language, fill all 2D lattice epsilon 12 and you can add geometry above this medium.

i did not try but you can add .h5 file epsilon according to x, y ,z coordinates.
(https://meep.readthedocs.io/en/latest/Scheme_User_Interface/)
(set! epsilon-input-file “multilayered.h5”)
(meep-structure-load structure "oled-epsilon.h5")))
http://www.simpetus.com/projects_scheme.html

I could not find adding material epsilon(frequency) as a file. In MEEP you can add epsilon value according to frequency.

from mpb.

MPB does not support frequency-dependent (dispersive) materials. You can input any nondispersive ε(x,y,z) you want, as explained in the manual and tutorials.

from mpb.