gplugins.tidy3d.modes.Waveguide

class gplugins.tidy3d.modes.Waveguide(*, wavelength: float | Sequence[float] | Any = None, core_width: float, core_thickness: float, core_material: float | int | str | Medium | CustomMedium | PoleResidue | tuple[float, float] | tuple[str, str], clad_material: float | int | str | Medium | CustomMedium | PoleResidue | tuple[float, float] | tuple[str, str], box_material: float | int | str | Medium | CustomMedium | PoleResidue | tuple[float, float] | tuple[str, str] | None = None, slab_thickness: float = 0.0, clad_thickness: float | None = None, box_thickness: float | None = None, side_margin: float | None = None, sidewall_angle: float = 0.0, sidewall_thickness: float = 0.0, sidewall_k: float = 0.0, surface_thickness: float = 0.0, surface_k: float = 0.0, bend_radius: float | None = None, num_modes: int = 2, group_index_step: bool | float = False, precision: Literal['single', 'double'] = 'double', grid_resolution: int = 20, max_grid_scaling: float = 1.2, cache_path: str | Path | None = PosixPath('/home/runner/.gdsfactory/modes'), overwrite: bool = False)

Waveguide Model.

All dimensions must be specified in μm (1e-6 m).

Parameters:

• wavelength – wavelength in free space.

• core_width – waveguide core width.

• core_thickness – waveguide core thickness (height).

• core_material – core material. One of: - string: material name. - float: refractive index. - float, float: refractive index real and imaginary part. - td.Medium: tidy3d medium. - function: function of wavelength.

• clad_material – top cladding material.

• box_material – bottom cladding material.

• slab_thickness – thickness of the slab region in a rib waveguide.

• clad_thickness – thickness of the top cladding.

• box_thickness – thickness of the bottom cladding.

• side_margin – domain extension to the side of the waveguide core.

• sidewall_angle – angle of the core sidewall w.r.t. the substrate normal.

• sidewall_thickness – thickness of a layer on the sides of the waveguide core to model side-surface losses.

• sidewall_k – absorption coefficient added to the core material index on the side-surface layer.

• surface_thickness – thickness of a layer on the top of the waveguide core and slabs to model top-surface losses.

• surface_k – absorption coefficient added to the core material index on the top-surface layer.

• bend_radius – radius to simulate circular bend.

• num_modes – number of modes to compute.

• group_index_step – if set to True, indicates that the group index must also be calculated. If set to a positive float it defines the fractional frequency step used for the numerical differentiation of the effective index.

• precision – computation precision.

• grid_resolution – wavelength resolution of the computation grid.

• max_grid_scaling – grid scaling factor in cladding regions.

• cache_path – Optional path to the cache directory. None disables cache.

• overwrite – overwrite cache.

________________________________________________
                                        ^
                                        ¦
                                        ¦
                                  clad_thickness
               |<--core_width-->|       ¦
                                        ¦
               .________________.      _v_
               |       ^        |
<-side_margin->|       ¦        |
               |       ¦        |
_______________'       ¦        '_______________
      ^          core_thickness
      ¦                ¦
slab_thickness         ¦
      ¦                ¦
      v                v
________________________________________________
                       ^
                       ¦
                 box_thickness
                       ¦
                       v
________________________________________________

__init__(**data: Any) → None

Create a new model by parsing and validating input data from keyword arguments.

Raises ValidationError if the input data cannot be parsed to form a valid model.

Methods

__init__(**data)	Create a new model by parsing and validating input data from keyword arguments.
construct([_fields_set])	Creates a new model setting __dict__ and __fields_set__ from trusted or pre-validated data.
copy(*[, include, exclude, update, deep])	Duplicate a model, optionally choose which fields to include, exclude and change.
dict(*[, include, exclude, by_alias, ...])	Generate a dictionary representation of the model, optionally specifying which fields to include or exclude.
from_orm(obj)
json(*[, include, exclude, by_alias, ...])	Generate a JSON representation of the model, include and exclude arguments as per dict().
overlap(waveguide[, conjugate])	Calculate the mode overlap between waveguide modes.
parse_file(path, *[, content_type, ...])
parse_obj(obj)
parse_raw(b, *[, content_type, encoding, ...])
plot_field(field_name[, value, mode_index, ...])	Plot the selected field distribution from a waveguide mode.
plot_grid()	Plot the waveguide grid.
plot_index(**kwargs)	Plot the waveguide index distribution.
schema([by_alias, ref_template])
schema_json(*[, by_alias, ref_template])
update_forward_refs(**localns)	Try to update ForwardRefs on fields based on this Model, globalns and localns.
validate(value)

Attributes

filepath	Cache file path
fraction_te	Fraction of TE polarization.
fraction_tm	Fraction of TM polarization.
index	Refractive index distribution on the simulation domain.
loss_dB_per_cm	Propagation loss for computed modes in dB/cm.
mode_area	Effective mode area.
n_eff	Effective propagation index.
n_group	Group index.
waveguide	Tidy3D waveguide used by this instance.
wavelength
core_width
core_thickness
core_material
clad_material
box_material
slab_thickness
clad_thickness
box_thickness
side_margin
sidewall_angle
sidewall_thickness
sidewall_k
surface_thickness
surface_k
bend_radius
num_modes
group_index_step
precision
grid_resolution
max_grid_scaling
cache_path
overwrite