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import unittest
import h5py
import numpy as np
import meep as mp
class TestDFTFields(unittest.TestCase):
def init(self):
resolution = 10
n = 3.4
w = 1.0
r = 1.0
pad = 4
self.dpml = 2
self.sxy = 2.0 * (r + w + pad + self.dpml)
cell = mp.Vector3(self.sxy, self.sxy)
pml_layers = [mp.PML(self.dpml)]
geometry = [
mp.Cylinder(r + w, material=mp.Medium(epsilon=n * n)),
mp.Cylinder(r, material=mp.vacuum),
]
self.fcen = 0.118
self.df = 0.1
src = mp.GaussianSource(self.fcen, fwidth=self.df)
sources = [mp.Source(src=src, component=mp.Ez, center=mp.Vector3(r + 0.1))]
return mp.Simulation(
cell_size=cell,
resolution=resolution,
geometry=geometry,
sources=sources,
boundary_layers=pml_layers,
)
def test_get_dft_array(self):
sim = self.init()
sim.init_sim()
dft_fields = sim.add_dft_fields([mp.Ez], self.fcen, self.fcen, 1)
fr = mp.FluxRegion(mp.Vector3(), size=mp.Vector3(self.sxy, self.sxy), direction=mp.X)
dft_flux = sim.add_flux(self.fcen, 0, 1, fr)
# volumes with zero thickness in x and y directions to test collapsing
# of empty dimensions in DFT array and HDF5 output routines
thin_x_volume = mp.volume( mp.vec(0.35*self.sxy, -0.4*self.sxy),
mp.vec(0.35*self.sxy, +0.4*self.sxy));
thin_x_flux = sim.fields.add_dft_fields([mp.Ez], thin_x_volume, self.fcen, self.fcen, 1)
thin_y_volume = mp.volume( mp.vec(-0.5*self.sxy, 0.25*self.sxy),
mp.vec(+0.5*self.sxy, 0.25*self.sxy));
thin_y_flux = sim.fields.add_dft_flux(mp.Y, thin_y_volume, self.fcen, self.fcen, 1)
sim.run(until_after_sources=100)
# test proper collapsing of degenerate dimensions in HDF5 files and arrays
thin_x_array = sim.get_dft_array(thin_x_flux, mp.Ez, 0)
thin_y_array = sim.get_dft_array(thin_y_flux, mp.Ez, 0)
np.testing.assert_equal(thin_x_array.ndim, 1)
np.testing.assert_equal(thin_y_array.ndim, 1)
sim.output_dft(thin_x_flux, 'thin-x-flux')
sim.output_dft(thin_y_flux, 'thin-y-flux')
with h5py.File('thin-x-flux.h5', 'r') as thin_x:
thin_x_h5 = thin_x['ez_0.r'].value + 1j * thin_x['ez_0.i'].value
with h5py.File('thin-y-flux.h5', 'r') as thin_y:
thin_y_h5 = thin_y['ez_0.r'].value + 1j * thin_y['ez_0.i'].value
np.testing.assert_allclose(thin_x_array, thin_x_h5)
np.testing.assert_allclose(thin_y_array, thin_y_h5)
# compare array data to HDF5 file content for fields and flux
fields_arr = sim.get_dft_array(dft_fields, mp.Ez, 0)
flux_arr = sim.get_dft_array(dft_flux, mp.Ez, 0)
sim.output_dft(dft_fields, 'dft-fields')
sim.output_dft(dft_flux, 'dft-flux')
with h5py.File('dft-fields.h5', 'r') as fields, h5py.File('dft-flux.h5', 'r') as flux:
exp_fields = fields['ez_0.r'].value + 1j * fields['ez_0.i'].value
exp_flux = flux['ez_0.r'].value + 1j * flux['ez_0.i'].value
np.testing.assert_allclose(exp_fields, fields_arr)
np.testing.assert_allclose(exp_flux, flux_arr)
if __name__ == '__main__':
unittest.main()
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