2D meshing: xy cross-section#
You can supply the argument type="xy" and a z-value, to mesh arbitrary Component planar cross-sections.
import gdsfactory as gf
import meshio
from gdsfactory.generic_tech import get_generic_pdk
from gdsfactory.pdk import get_layer_stack
from gdsfactory.technology import LayerStack
from skfem.io import from_meshio
from gplugins.gmsh.get_mesh import create_physical_mesh, get_mesh
gf.config.rich_output()
PDK = get_generic_pdk()
PDK.activate()
waveguide = gf.components.straight_pin(length=10, taper=None)
waveguide.plot()
filtered_layer_stack = LayerStack(
layers={
k: get_layer_stack().layers[k]
for k in (
"slab90",
"core",
"via_contact",
)
}
)
filename = "mesh"
def mesh_with_physicals(mesh, filename):
mesh_from_file = meshio.read(f"{filename}.msh")
return create_physical_mesh(mesh_from_file, "triangle")
At z=0.09 um, according to the layer stack above we should see polygons from all three layers:
filename = "mesh"
mesh = get_mesh(
component=waveguide,
type="xy",
z=0.09,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
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Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.00813192s, CPU 0.011944s)
Info : Meshing 2D...
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Info : Done meshing 2D (Wall 0.0494003s, CPU 0.078358s)
Info : 2064 nodes 4514 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmp9kttbby9/mesh.msh'...
Info : Done writing '/tmp/tmp9kttbby9/mesh.msh'
[]
At z=0, you can see only the core and slab:
mesh = get_mesh(
component=waveguide,
type="xy",
z=0.0,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
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Info : [ 80%] Difference - Making faces
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Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.0250406s, CPU 0.077224s)
Info : Meshing 2D...
Info : Meshing surface 1 (Plane, Frontal-Delaunay)
Info : Done meshing 2D (Wall 0.0369686s, CPU 0.075629s)
Info : 1102 nodes 2206 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmpaon8gaf_/mesh.msh'...
Info : Done writing '/tmp/tmpaon8gaf_/mesh.msh'
Warning : Boolean fragments skipped - too few arguments
[]
At z=1.0, you can only see the vias appear:
mesh = get_mesh(
component=waveguide,
type="xy",
z=1.0,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
Info : [ 0%] Union
Info : [ 10%] Union - Performing intersection of shapes
Info : [ 80%] Union - Building splits of containers
Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.0256682s, CPU 0.070367s)
Info : Meshing 2D...
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Info : Done meshing 2D (Wall 0.0138975s, CPU 0.02707s)
Info : 384 nodes 832 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmpmaclj9ks/mesh.msh'...
Info : Done writing '/tmp/tmpmaclj9ks/mesh.msh'
[]
Controlling meshing domain#
You can use functions that return other components to modify the simulation domain, for instance gdsfactory.geometry.trim:
waveguide = gf.components.straight_pin(length=11, taper=None)
waveguide.trim(left=3, right=5, bottom=-4, top=4)
waveguide
mesh = get_mesh(
component=waveguide,
type="xy",
z=0.09,
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
Info : [ 0%] Union
Info : [ 10%] Union - Performing intersection of shapes
Info : [ 80%] Union - Building splits of containers
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Info : Meshing 1D...
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Info : Done meshing 1D (Wall 0.00202361s, CPU 0.006098s)
Info : Meshing 2D...
Info : [ 0%] Meshing surface 2 (Plane, Frontal-Delaunay)
Info : [ 0%] Meshing surface 3 (Plane, Frontal-Delaunay)
Info : [ 0%] Meshing surface 1 (Plane, Frontal-Delaunay)
Info : Done meshing 2D (Wall 0.0126897s, CPU 0.032171s)
Info : 131 nodes 288 elements
Info : Writing 'mesh.msh'...
Info : Done writing 'mesh.msh'
Info : Writing '/tmp/tmps1nx_svx/mesh.msh'...
Info : Done writing '/tmp/tmps1nx_svx/mesh.msh'
[]
