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import unittest
import meep as mp
class TestPhysical(unittest.TestCase):
def test_physical(self):
a = 10.0
ymax = 3.0
xmax = 8.0
dx = 2.0
w = 0.30
cell_size = mp.Vector3(xmax, ymax)
pml_layers = [mp.PML(ymax / 3.0)]
sources = [
mp.Source(
src=mp.ContinuousSource(w),
component=mp.Ez,
center=mp.Vector3(-dx),
size=mp.Vector3(),
)
]
sim = mp.Simulation(
cell_size=cell_size,
resolution=a,
boundary_layers=pml_layers,
sources=sources,
force_complex_fields=True,
)
sim.init_sim()
sim.solve_cw(tol=1e-5 if mp.is_single_precision() else 1e-6)
p1 = mp.Vector3()
p2 = mp.Vector3(dx)
amp1 = sim.get_field_point(mp.Ez, p1)
amp2 = sim.get_field_point(mp.Ez, p2)
ratio = abs(amp1) / abs(amp2)
ratio = ratio**2 # in 2d, decay is ~1/sqrt(r), so square to get 1/r
fail_fmt = "Failed: amp1 = ({}, {}), amp2 = ({}, {})\nabs(amp1/amp2){} = {}, too far from 2.0"
fail_msg = fail_fmt.format(amp1.real, amp1, amp2.real, amp2, "^2", ratio)
self.assertTrue(ratio <= 2.12 and ratio >= 1.88, fail_msg)
if __name__ == "__main__":
unittest.main()
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