Crossing

MEEP is an open-source FDTD electromagnetic simulator. This notebook demonstrates using the gsim.meep API to run an S-parameter simulation on a photonic Y-branch.

Requirements:

UBC PDK: uv pip install ubcpdk
GDSFactory+ account for cloud simulation

Load a pcell from UBC PDK¶

from ubcpdk import PDK, cells

PDK.activate()

c = cells.ebeam_crossing4()

c

png

Configure and run simulation¶

from gsim import meep
from gsim.common.stack import get_stack

stack = get_stack()  # auto-detects active PDK

sim = meep.Simulation()

sim.geometry(component=c, stack=stack, z_crop="auto")
sim.materials = {"si": 3.47, "SiO2": 1.44}
sim.source(port="o1", wavelength=1.55, wavelength_span=0.04)
sim.monitors = ["o1", "o2", "o3", "o4"]
sim.domain(pml=1.0, margin=0.5)
sim.solver(resolution=20, save_animation=True, verbose_interval=5.0)
sim.num_freqs = 51
sim.solver.stop_when_energy_decayed()

print(sim.validate_config())

sim.plot_2d(slices="xyz")

simulation.py:713: UserWarning: Material 'Aluminum' has no optical properties (refractive_index) — layer will be omitted from simulation. Use sim.set_material('Aluminum', refractive_index=...) to include it.
  material_data = resolve_materials(
simulation.py:713: UserWarning: Material 'TiN' has no optical properties (refractive_index) — layer will be omitted from simulation. Use sim.set_material('TiN', refractive_index=...) to include it.
  material_data = resolve_materials(
simulation.py:713: UserWarning: Material 'passive' has no optical properties (refractive_index) — layer will be omitted from simulation. Use sim.set_material('passive', refractive_index=...) to include it.
  material_data = resolve_materials(

png

Run simulation on cloud¶

# Run on GDSFactory+ cloud
result = sim.run()

  meep-a1453ebb  completed  3m 15s


Extracting results.tar.gz...


Downloaded 207 files to sim-data-meep-a1453ebb

result.plot_interactive()

result.plot_interactive(phase=True)

result.show_animation()