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import meep as mp
# Example file illustrating an eigenmode source, generating a waveguide mode
# (requires recent MPB version to be installed before Meep is compiled)
cell = mp.Vector3(16, 8)
# an asymmetrical dielectric waveguide:
geometry = [
mp.Block(
center=mp.Vector3(),
size=mp.Vector3(mp.inf, 1, mp.inf),
material=mp.Medium(epsilon=12),
),
mp.Block(
center=mp.Vector3(y=0.3),
size=mp.Vector3(mp.inf, 0.1, mp.inf),
material=mp.Medium(),
),
]
# create a transparent source that excites a right-going waveguide mode
sources = [
mp.EigenModeSource(
src=mp.ContinuousSource(0.15),
size=mp.Vector3(y=6),
center=mp.Vector3(x=-5),
component=mp.Dielectric,
eig_parity=mp.ODD_Z,
)
]
pml_layers = [mp.PML(1.0)]
force_complex_fields = True # so we can get time-average flux
resolution = 10
sim = mp.Simulation(
cell_size=cell,
geometry=geometry,
sources=sources,
boundary_layers=pml_layers,
force_complex_fields=force_complex_fields,
resolution=resolution,
)
sim.run(
mp.at_beginning(mp.output_epsilon),
mp.at_end(mp.output_png(mp.Ez, "-a yarg -A $EPS -S3 -Zc dkbluered", rm_h5=False)),
until=200,
)
flux1 = sim.flux_in_box(
mp.X, mp.Volume(center=mp.Vector3(-6.0), size=mp.Vector3(1.8, 6))
)
flux2 = sim.flux_in_box(
mp.X, mp.Volume(center=mp.Vector3(6.0), size=mp.Vector3(1.8, 6))
)
# averaged over y region of width 1.8
print(f"left-going flux = {flux1 / -1.8}")
# averaged over y region of width 1.8
print(f"right-going flux = {flux2 / 1.8}")
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