Running MEEP Simulations¶

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
from gsim.meep.models.api import Material

stack = get_stack()  # auto-detects active PDK

sim = meep.Simulation()

sim.geometry(component=c, stack=stack)
sim.materials = {
    "si": Material(refractive_index=3.47),
    "SiO2": Material(refractive_index=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_x=0.5, margin_y=0.5, z_ref="stack")
sim.solver(resolution=20, save_animation=True, verbose_interval=5.0)
sim.num_freqs = 21
sim.solver.stop_when_energy_decayed()

print(sim.validate_config())

Stack validation: PASSED
Warnings:
  - Stopping: energy_decay (dt=20.0, decay_by=0.01, cap=2000.0)

sim.plot_2d(slices="xyz")

png

Run simulation on cloud¶

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

  meep-d04b529b  completed  3m 13s


Extracting results.tar.gz...
Downloaded 207 files to /home/runner/work/simulation-templates/simulation-templates/docs/notebooks/sim-data-meep-d04b529b

result.plot_interactive()

result.plot_interactive(phase=True)

result.show_animation()