2D meshing: uz cross-section#
You can mesh an out of plane Component cross-section by supplying the argument type="uz" and a xsection_bounds under the form [[x1,y1], [x2,y2]], which parametrizes a line in u-coordinates
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_trimmed = gf.Component()
waveguide_trimmed.add_ref(
gf.geometry.trim(
component=waveguide,
domain=[[3, -4], [3, 4], [5, 4], [5, -4]],
)
)
waveguide_trimmed.plot()
2024-05-10 10:29:18.935 | WARNING | gdsfactory.component:plot_klayout:1645 - UserWarning: Unnamed cells, 1 in 'Unnamed_cc7bdef9'
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")
Choosing the line going from y=-4 to y=4 at x=4, which crosses slab, via, and core:
mesh = get_mesh(
component=waveguide_trimmed,
type="uz",
xsection_bounds=[(4, -4), (4, 4)],
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 : Done meshing 1D (Wall 0.00277949s, CPU 0.004259s)
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Info : Done meshing 2D (Wall 0.0010468s, CPU 0.001665s)
Info : 69 nodes 162 elements
Info : Writing 'mesh.msh'...
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[]
We can plot as usual (note that the u-z coordinates we are working in still map to xy for the plotter):
Mesh background#
You can add a convenience argument to add a background mesh around the geometry (instead of defining a dummy polygon and layer in the layer_stack with low mesh_order):
mesh = get_mesh(
component=waveguide_trimmed,
type="uz",
xsection_bounds=[(4, -4), (4, 4)],
layer_stack=filtered_layer_stack,
filename=f"{filename}.msh",
background_tag="oxide",
background_padding=(2.0, 2.0, 2.0, 2.0),
)
mesh = mesh_with_physicals(mesh, filename)
mesh = from_meshio(mesh)
mesh.draw().plot()
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Info : Done meshing 1D (Wall 0.0142135s, CPU 0.045056s)
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Info : Done meshing 2D (Wall 0.0319324s, CPU 0.079582s)
Info : 504 nodes 1093 elements
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[]
