ExtrusionSpec¶

class photonforge.ExtrusionSpec(mask_spec, medium, limits, sidewall_angle=0)¶

Extrusion specification for masks.

This class is mainly used to create extrusion recipes for a Technology.

Parameters:

mask_spec – Mask specification for this extrusion.
medium – Tidy3D medium for the resulting structures.
limits – Out-of-plane extrusion limits.
sidewall_angle – Sidewall angle for extrusion (in degrees). Affects the bottom face of the extruded mask (reference on top). Positive (negative) values will dilate (erode) the bottom face.

Example

>>> extrusion_spec = ExtrusionSpec(
...     MaskSpec((1, 0)),
...     td.Medium(permittivity=3.48**2),
...     limits=(0, 0.250),
...     sidewall_angle=8,
... )

Methods

`copy`([deep])	Create a copy of this extrusion specification.
`extrude`(*structures[, extrusion_tolerance])	Extrude planar structures according to this extrusion specification.
`from_json`(json_str)	Create an extrusion specification object from a json string.

Attributes

`json`	Json representation of this extrusion specification.
`limits`	Extrusion limits.
`mask_spec`	Extrusion mask specification.
`medium`	Extrusion medium.
`sidewall_angle`	Extrusion sidewall_angle.

copy(deep=False)¶

Create a copy of this extrusion specification.

Parameters:: deep – If set, creates a copy of mask specification as well. Otherwise, the same mask specification object will be used.
Returns:: New copy.

extrude(*structures, extrusion_tolerance=0)¶

Extrude planar structures according to this extrusion specification.

Parameters:

*structures – Structures to be extruded. Must be instances of Rectangle, Circle, :class:`Polygon, or Path.
extrusion_tolerance – Minimal dimension to search for topological changes in angled extrusions or fallback to an orthogonal profile. A value of 0 or less defaults to config.tolerance.

Returns:

List of polyhedra.

Note

The mask specification in this object is not taken into account. All structures are used in the extrusion and no dilation is applied.

static from_json(json_str)¶

Create an extrusion specification object from a json string.

Parameters:: json_str – Strig containing the json data.
Returns:: ExtrusionSpec instance.

json¶: Json representation of this extrusion specification.

limits¶: Extrusion limits.

mask_spec¶: Extrusion mask specification.

medium¶: Extrusion medium.

sidewall_angle¶: Extrusion sidewall_angle.