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import math
import meep as mp
from meep import mpb
# A triangular lattice of dielectric rods in air. (This structure has
# a band_gap for TM fields.) This file is used in the "Data Analysis
# Tutorial" section of the MPB manual.
num_bands = 8
geometry_lattice = mp.Lattice(
size=mp.Vector3(1, 1),
basis1=mp.Vector3(math.sqrt(3) / 2, 0.5),
basis2=mp.Vector3(math.sqrt(3) / 2, -0.5),
)
geometry = [mp.Cylinder(0.2, material=mp.Medium(epsilon=12))]
k_points = [
mp.Vector3(), # Gamma
mp.Vector3(y=0.5), # M
mp.Vector3(1 / -3, 1 / 3), # K
mp.Vector3(), # Gamma
]
k_points = mp.interpolate(4, k_points)
resolution = 32
ms = mpb.ModeSolver(
geometry=geometry,
geometry_lattice=geometry_lattice,
k_points=k_points,
resolution=resolution,
num_bands=num_bands,
)
def main():
ms.run_tm(
mpb.output_at_kpoint(
mp.Vector3(1 / -3, 1 / 3), mpb.fix_efield_phase, mpb.output_efield_z
)
)
ms.run_te()
if __name__ == "__main__":
main()
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