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.bend_s(size=(20.0, 5.0))

c

png

Configure and run simulation¶

from gsim import meep
from gsim.meep.models.api import Material

sim = meep.Simulation()

sim.geometry(component=c)
sim.materials = {
    "si": Material(refractive_index=3.47),
    "SiO2": Material(refractive_index=1.44),
}
sim.source(port="o1", wavelength=1.55, wavelength_span=0.01)
sim.num_freqs = 21
sim.monitors = ["o1", "o2"]
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.solver.stop_after_sources(time=100)

print(sim.validate_config())

Stack validation: PASSED
Warnings:
  - No stack configured. Will use active PDK with defaults.
  - Stopping: fixed (time=100.0)

sim.plot_2d(slices="xyz")

png

Run simulation on cloud¶

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

  meep-7f5ba74e  completed  6m 36s


Extracting results.tar.gz...
Downloaded 362 files to /home/runner/work/simulation-templates/simulation-templates/docs/notebooks/sim-data-meep-7f5ba74e

result.plot(db=True)

png

result.show_animation()