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# medium_evaluations.py - Tests the evaluation of material permitivity profiles.
# Checks materials with lorentizian, drude, and non uniform diagonals.
# The extracted values are compared against actual datapoints pulled from
# refractiveindex.info.
# TODO:
# * check materials with off diagonal components
# * check magnetic profiles
import unittest
import numpy as np
import meep as mp
class TestMediumEvaluations(unittest.TestCase):
def test_medium_evaluations(self):
from meep.materials import Ag, LiNbO3, Si, fused_quartz
# Check that scalars work
w0 = LiNbO3.valid_freq_range.min
eps = LiNbO3.epsilon(w0)
self.assertAlmostEqual(np.real(np.sqrt(eps[0, 0])), 2.0508, places=4)
# Check numpy arrays
try:
w0 = Si.valid_freq_range.min
w1 = Si.valid_freq_range.max
eps = Si.epsilon(np.linspace(w0, w1, 100))
except ExceptionType:
self.fail("myFunc() raised ExceptionType unexpectedly!")
# Check that regions outside of domain don't work
self.assertRaises(ValueError, LiNbO3.epsilon, -1.0)
self.assertRaises(ValueError, LiNbO3.epsilon, 10000.0)
# Check complex vs non complex numbers
self.assertTrue(np.iscomplex(Ag.epsilon(1.0)[0, 0]))
self.assertFalse(np.iscomplex(fused_quartz.epsilon(1.0)[0, 0]))
# Check Silicon
w0 = Si.valid_freq_range.min
w1 = Si.valid_freq_range.max
eps = Si.epsilon([w0, w1])
self.assertAlmostEqual(np.real(np.sqrt(eps[0, 0, 0])), 3.4175, places=4)
self.assertAlmostEqual(np.real(np.sqrt(eps[1, 0, 0])), 3.4971, places=4)
# Check Silver
w0 = Ag.valid_freq_range.min
w1 = Ag.valid_freq_range.max
eps = Ag.epsilon([w0, w1])
self.assertAlmostEqual(np.real(np.sqrt(eps[0, 0, 0])), 17.485, places=2)
self.assertAlmostEqual(np.real(np.sqrt(eps[1, 0, 0])), 0.44265, places=4)
# Check Lithium Niobate
w0 = LiNbO3.valid_freq_range.min
w1 = LiNbO3.valid_freq_range.max
eps = LiNbO3.epsilon([w0, w1])
self.assertAlmostEqual(np.real(np.sqrt(eps[0, 0, 0])), 2.0508, places=4)
self.assertAlmostEqual(np.real(np.sqrt(eps[1, 0, 0])), 2.4393, places=4)
self.assertAlmostEqual(np.real(np.sqrt(eps[0, 2, 2])), 2.0025, places=4)
self.assertAlmostEqual(np.real(np.sqrt(eps[1, 2, 2])), 2.3321, places=4)
if __name__ == "__main__":
unittest.main()
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