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import cmath
import math
import unittest
from utils import ApproxComparisonTestCase
import meep as mp
class TestPwSource(ApproxComparisonTestCase):
def setUp(self):
s = 11
dpml = 1
sxy = s + 2 * dpml
cell = mp.Vector3(sxy, sxy, 0)
pml_layers = [mp.PML(dpml)]
resolution = 10
def pw_amp(k, x0):
def _pw_amp(x):
return cmath.exp(1j * k.dot(x + x0))
return _pw_amp
fcen = 0.8
df = 0.02
kdir = mp.Vector3(1, 1)
self.k = kdir.unit().scale(2 * math.pi * fcen)
sources = [
mp.Source(
mp.ContinuousSource(fcen, fwidth=df),
component=mp.Ez,
center=mp.Vector3(-0.5 * s, 0),
size=mp.Vector3(0, s),
amp_func=pw_amp(self.k, mp.Vector3(x=-0.5 * s)),
),
mp.Source(
mp.ContinuousSource(fcen, fwidth=df),
component=mp.Ez,
center=mp.Vector3(0, -0.5 * s),
size=mp.Vector3(s, 0),
amp_func=pw_amp(self.k, mp.Vector3(y=-0.5 * s)),
),
]
self.sim = mp.Simulation(
cell_size=cell,
sources=sources,
boundary_layers=pml_layers,
resolution=resolution,
)
self.sim.use_output_directory(self.temp_dir)
self.s = s
@classmethod
def setUpClass(cls):
cls.temp_dir = mp.make_output_directory()
@classmethod
def tearDownClass(cls):
mp.delete_directory(cls.temp_dir)
def test_pw_source(self):
self.sim.run(mp.at_end(mp.output_efield_z), until=400)
v1 = mp.Vector3(0.5 * self.s, 0)
v2 = mp.Vector3(0.5 * self.s, 0.5 * self.s)
pt1 = self.sim.get_field_point(mp.Ez, v1)
pt2 = self.sim.get_field_point(mp.Ez, v2)
tol = 1e-4 if mp.is_single_precision() else 1e-9
self.assertClose(pt1 / pt2, 27.557668029008262, epsilon=tol)
self.assertAlmostEqual(
cmath.exp(1j * self.k.dot(v1 - v2)),
0.7654030066070924 - 0.6435512702783076j,
)
if __name__ == "__main__":
unittest.main()
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