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:

GDSFactory+ account for cloud simulation

Load a pcell from the active PDK¶

import gdsfactory as gf
import gdsfactoryplus as gfp

pdk = gfp.get_pdk()
pdk.activate()

c = gf.get_component("crossing")

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_bounds=(-1.0, 1.5), extend_into_pml=True
)
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())

[34m04:49:05[0m | [33m[22mWARNING [0m | [33m[22mpyvirtualdisplay not available; continuing without Xvfb[0m


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

sim.plot_2d(slices="z")

png

Run simulation on cloud¶

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

  meep-678e850e  completed  0m 00s


Extracting results.tar.gz...
Downloaded 207 files to sim-data-meep-678e850e

result.plot_interactive()

result.plot_interactive(phase=True)

result.show_animation()