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from __future__ import division
import os
import unittest
import numpy as np
import meep as mp
from utils import compare_arrays
class TestBendFlux(unittest.TestCase):
def init(self, no_bend=False, gdsii=False):
sx = 16
sy = 32
cell = mp.Vector3(sx, sy, 0)
pad = 4
w = 1
wvg_ycen = -0.5 * (sy - w - (2 * pad))
wvg_xcen = 0.5 * (sx - w - (2 * pad))
height = 100
data_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data')
gdsii_file = os.path.join(data_dir, 'bend-flux.gds')
if no_bend:
if gdsii:
geometry = mp.get_GDSII_prisms(mp.Medium(epsilon=12), gdsii_file, 1)
else:
no_bend_vertices = [mp.Vector3(-0.5 * sx - 5, wvg_ycen - 0.5 * w),
mp.Vector3(+0.5 * sx + 5, wvg_ycen - 0.5 * w),
mp.Vector3(+0.5 * sx + 5, wvg_ycen + 0.5 * w),
mp.Vector3(-0.5 * sx - 5, wvg_ycen + 0.5 * w)]
geometry = [mp.Prism(no_bend_vertices, height, material=mp.Medium(epsilon=12))]
else:
if gdsii:
geometry = mp.get_GDSII_prisms(mp.Medium(epsilon=12), gdsii_file, 2)
else:
bend_vertices = [mp.Vector3(-0.5 * sx, wvg_ycen - 0.5 * w),
mp.Vector3(wvg_xcen + 0.5 * w, wvg_ycen - 0.5 * w),
mp.Vector3(wvg_xcen + 0.5 * w, 0.5 * sy),
mp.Vector3(wvg_xcen - 0.5 * w, 0.5 * sy),
mp.Vector3(wvg_xcen - 0.5 * w, wvg_ycen + 0.5 * w),
mp.Vector3(-0.5 * sx, wvg_ycen + 0.5 * w)]
geometry = [mp.Prism(bend_vertices, height, material=mp.Medium(epsilon=12))]
fcen = 0.15
df = 0.1
sources = [mp.Source(mp.GaussianSource(fcen, fwidth=df), component=mp.Ez,
center=mp.Vector3(1 + (-0.5 * sx), wvg_ycen), size=mp.Vector3(0, w))]
pml_layers = [mp.PML(1.0)]
resolution = 10
nfreq = 100
self.sim = mp.Simulation(cell_size=cell,
boundary_layers=pml_layers,
geometry=geometry,
sources=sources,
resolution=resolution)
if no_bend:
fr = mp.FluxRegion(center=mp.Vector3((sx / 2) - 1.5, wvg_ycen), size=mp.Vector3(0, w * 2))
else:
fr = mp.FluxRegion(center=mp.Vector3(wvg_xcen, (sy / 2) - 1.5), size=mp.Vector3(w * 2, 0))
self.trans = self.sim.add_flux(fcen, df, nfreq, fr)
refl_fr = mp.FluxRegion(center=mp.Vector3((-0.5 * sx) + 1.5, wvg_ycen),
size=mp.Vector3(0, w * 2))
self.refl = self.sim.add_flux(fcen, df, nfreq, refl_fr)
if no_bend:
self.pt = mp.Vector3((sx / 2) - 1.5, wvg_ycen)
else:
self.pt = mp.Vector3(wvg_xcen, (sy / 2) - 1.5)
def run_bend_flux(self, from_gdsii_file):
# Normalization run
self.init(no_bend=True, gdsii=from_gdsii_file)
self.sim.run(until_after_sources=mp.stop_when_fields_decayed(50, mp.Ez, self.pt, 1e-3))
# Save flux data for use in real run below
fdata = self.sim.get_flux_data(self.refl)
expected = [
(0.1, 3.65231563251e-05, 3.68932495077e-05),
(0.10101010101, 5.55606718876e-05, 5.6065539588e-05),
(0.10202020202, 8.38211697478e-05, 8.44909864736e-05),
(0.10303030303, 0.000125411162229, 0.000126268639045),
(0.10404040404, 0.000186089117531, 0.000187135303398),
(0.105050505051, 0.000273848867869, 0.000275039134667),
(0.106060606061, 0.000399674037745, 0.000400880269423),
(0.107070707071, 0.00057849953593, 0.000579454087881),
(0.108080808081, 0.000830418432986, 0.000830635406881),
(0.109090909091, 0.00118217282661, 0.00118084271347),
(0.110101010101, 0.00166896468348, 0.00166481944189),
(0.111111111111, 0.00233661613864, 0.00232776318321),
(0.112121212121, 0.00324409729096, 0.00322782257917),
(0.113131313131, 0.00446642217385, 0.00443896468822),
(0.114141414141, 0.0060978895019, 0.0060541922825),
(0.115151515152, 0.00825561352398, 0.00818906047274),
(0.116161616162, 0.0110832518495, 0.010985404883),
(0.117171717172, 0.0147547920552, 0.0146151488236),
(0.118181818182, 0.0194782085272, 0.0192840042241),
(0.119191919192, 0.0254987474079, 0.0252348211592),
]
res = list(zip(mp.get_flux_freqs(self.trans), mp.get_fluxes(self.trans), mp.get_fluxes(self.refl)))
tolerance = 1e-2 if from_gdsii_file else 1e-3
compare_arrays(self, np.array(expected), np.array(res[:20]), tol=tolerance)
# Real run
self.sim = None
self.init(gdsii=from_gdsii_file)
# Load flux data obtained from normalization run
self.sim.load_minus_flux_data(self.refl, fdata)
self.sim.run(until_after_sources=mp.stop_when_fields_decayed(50, mp.Ez, self.pt, 1e-3))
expected = [
(0.09999999999999999, 1.8392235204829767e-5, -7.259467687598002e-6),
(0.10101010101010101, 2.7629932558236724e-5, -1.1107162110079347e-5),
(0.10202020202020202, 4.1001228946782745e-5, -1.687561915798036e-5),
(0.10303030303030304, 6.018966076122556e-5, -2.5425779493709066e-5),
(0.10404040404040406, 8.758554071933231e-5, -3.794958119189475e-5),
(0.10505050505050507, 1.2656696778129198e-4, -5.612512808928115e-5),
(0.10606060606060609, 1.817948859871414e-4, -8.232188174309142e-5),
(0.10707070707070711, 2.594514094902856e-4, -1.1981531280672989e-4),
(0.10808080808080812, 3.6736164837695035e-4, -1.7300125173897737e-4),
(0.10909090909090914, 5.150131339048232e-4, -2.476730940385436e-4),
(0.11010101010101016, 7.136181099374187e-4, -3.5145561406042276e-4),
(0.11111111111111117, 9.76491765781944e-4, -4.944142331545938e-4),
(0.11212121212121219, 0.001320033637882244, -6.897357105189368e-4),
(0.11313131313131321, 0.0017653940714397098, -9.543556354451615e-4),
(0.11414141414141422, 0.0023404727796352857, -0.0013095604571818236),
(0.11515151515151524, 0.0030813962415392098, -0.00178176942635486),
(0.11616161616161626, 0.00403238648982478, -0.0024036650652026112),
(0.11717171717171727, 0.005243320443599316, -0.003215529845495731),
(0.11818181818181829, 0.0067654019326068, -0.004266367104375331),
(0.11919191919191931, 0.008646855439680507, -0.005614491919262783),
]
res = list(zip(mp.get_flux_freqs(self.trans), mp.get_fluxes(self.trans), mp.get_fluxes(self.refl)))
tolerance = 1e-2 if from_gdsii_file else 1e-3
compare_arrays(self, np.array(expected), np.array(res[:20]), tol=tolerance)
def test_bend_flux(self):
self.run_bend_flux(False)
if mp.with_libGDSII():
self.run_bend_flux(True)
if __name__ == '__main__':
unittest.main()
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