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import unittest
import meep as mp
# Material function that recreates the ellipsoid-in-cylinder configuration of
# examples/cyl-ellipsoid.py
def my_material_func(p):
R1X = 0.5
R1Y = 1.0
R2 = 3.0
x = p.x
y = p.y
# test for point inside inner ellipsoid
if (x**2 / (R1X**2) + y**2 / (R1Y**2)) < 1.0:
nn = 1.0
elif (x**2 / (R2**2) + y**2 / (R2**2)) < 1.0:
nn = 3.5
else:
nn = 1.0
return mp.Medium(epsilon=nn**2)
def my_epsilon_func(p):
R1X = 0.5
R1Y = 1.0
R2 = 3.0
x = p.x
y = p.y
if (x**2 / (R1X**2) + y**2 / (R1Y**2)) < 1.0:
return 1.0
elif (x**2 / (R2**2) + y**2 / (R2**2)) < 1.0:
return 3.5
return 1.0
class TestUserMaterials(unittest.TestCase):
def setUp(self):
self.resolution = 10
self.cell = mp.Vector3(10, 10)
self.symmetries = [mp.Mirror(mp.X), mp.Mirror(mp.Y)]
self.boundary_layers = [mp.PML(1.0)]
self.sources = [
mp.Source(
src=mp.GaussianSource(0.2, fwidth=0.1),
component=mp.Ez,
center=mp.Vector3(),
)
]
def test_user_material_func(self):
sim = mp.Simulation(
cell_size=self.cell,
resolution=self.resolution,
symmetries=self.symmetries,
boundary_layers=self.boundary_layers,
sources=self.sources,
material_function=my_material_func,
)
sim.run(until=200)
fp = sim.get_field_point(mp.Ez, mp.Vector3(x=1))
places = 3 if mp.is_single_precision() else 7
self.assertAlmostEqual(fp, 4.816403627871773e-4, places=places)
def test_epsilon_func(self):
sim = mp.Simulation(
cell_size=self.cell,
resolution=self.resolution,
symmetries=self.symmetries,
boundary_layers=self.boundary_layers,
sources=self.sources,
epsilon_func=my_epsilon_func,
)
sim.run(until=100)
fp = sim.get_field_point(mp.Ez, mp.Vector3(x=1))
self.assertAlmostEqual(fp, -7.895783750440999e-4)
def test_geometric_obj_with_user_material(self):
geometry = [mp.Cylinder(5, material=my_material_func)]
sim = mp.Simulation(
cell_size=self.cell,
resolution=self.resolution,
symmetries=self.symmetries,
geometry=geometry,
boundary_layers=self.boundary_layers,
sources=self.sources,
)
sim.run(until=200)
fp = sim.get_field_point(mp.Ez, mp.Vector3(x=1))
places = 3 if mp.is_single_precision() else 7
self.assertAlmostEqual(fp, 4.816403627871773e-4, places=places)
def test_geometric_obj_with_epsilon_func(self):
geometry = [mp.Cylinder(5, epsilon_func=my_epsilon_func)]
sim = mp.Simulation(
cell_size=self.cell,
resolution=self.resolution,
symmetries=self.symmetries,
geometry=geometry,
boundary_layers=self.boundary_layers,
sources=self.sources,
)
sim.run(until=100)
fp = sim.get_field_point(mp.Ez, mp.Vector3(x=1))
self.assertAlmostEqual(fp, -7.895783750440999e-4)
if __name__ == "__main__":
unittest.main()
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