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# -*- coding: utf-8 -*-
import meep as mp
from meep.materials import fused_quartz
resolution = 200 # pixels/μm
dpml = 1.0
sz = 10 + 2*dpml
cell_size = mp.Vector3(0,0,sz)
pml_layers = [ mp.PML(dpml) ]
wvl_min = 0.4
wvl_max = 0.8
fmin = 1/wvl_max
fmax = 1/wvl_min
fcen = 0.5*(fmax+fmin)
df = fmax-fmin
nfreq = 50
sources = [ mp.Source(mp.GaussianSource(fcen,fwidth=df), component=mp.Ex, center=mp.Vector3(0,0,-0.5*sz+dpml)) ]
sim = mp.Simulation(cell_size=cell_size,
boundary_layers=pml_layers,
sources=sources,
dimensions=1,
resolution=resolution)
refl_fr = mp.FluxRegion(center=mp.Vector3(0,0,-0.25*sz))
refl = sim.add_flux(fcen, df, nfreq, refl_fr)
sim.run(until_after_sources=mp.stop_when_fields_decayed(50, mp.Ex, mp.Vector3(), 1e-9))
empty_flux = mp.get_fluxes(refl)
empty_data = sim.get_flux_data(refl)
sim.reset_meep()
geometry = [ mp.Block(mp.Vector3(mp.inf,mp.inf,0.5*sz), center=mp.Vector3(0,0,0.25*sz), material=fused_quartz) ]
sim = mp.Simulation(cell_size=cell_size,
boundary_layers=pml_layers,
geometry=geometry,
sources=sources,
dimensions=1,
resolution=resolution)
refl = sim.add_flux(fcen, df, nfreq, refl_fr)
sim.load_minus_flux_data(refl, empty_data)
sim.run(until_after_sources=mp.stop_when_fields_decayed(50, mp.Ex, mp.Vector3(), 1e-9))
refl_flux = mp.get_fluxes(refl)
freqs = mp.get_flux_freqs(refl)
for i in range(0,nfreq):
print("refl:, {}, {}".format(1/freqs[i],-refl_flux[i]/empty_flux[i]))
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