tidy3d.CustomChargePerturbation

class CustomChargePerturbation

Bases: ChargePerturbation

Specifies parameter’s perturbation due to free carrier effects as a custom function of electron and hole densities defined as a two-dimensional array of perturbation values at sample electron and hole density points.

Parameters:

• electron_range (Optional[tuple[NonNegativeFloat, NonNegativeFloat]] = None) – Range of electrons densities in which perturbation model is valid. For CustomChargePerturbation this field is computed automatically based on provided perturbation_values

• hole_range (Optional[tuple[NonNegativeFloat, NonNegativeFloat]] = None) – Range of holes densities in which perturbation model is valid. For CustomChargePerturbation this field is computed automatically based on provided perturbation_values

• perturbation_values (ChargeDataArray) – 2D array (vs electron and hole densities) of sampled perturbation values.

• interp_method (Literal['nearest', 'linear'] = linear) – Interpolation method to obtain perturbation values between sample points.

Notes

The linear interpolation is used to calculate perturbation values between sample points. For electron and hole density values outside of the provided sample region the perturbation value is extrapolated as a constant. The electron and hole density ranges, electron_range and hole_range, in which the perturbation model is assumed to be accurate is calculated automatically as the minimal and maximal density values provided in perturbation_values. Wherever is applied, Tidy3D will check that the parameter’s value does not go out of its physical bounds within electron_range x hole_range due to perturbations and raise a warning if this check fails. A warning is also issued if the perturbation model is evaluated outside of electron_range x hole_range.

Example

>>> from tidy3d import ChargeDataArray
>>> perturbation_data = ChargeDataArray(
...     [[0.001, 0.002, 0.004], [0.003, 0.002, 0.001]],
...     coords=dict(n=[2e15, 2e19], p=[1e16, 1e17, 1e18]),
... )
>>> charge_perturb = CustomChargePerturbation(
...     perturbation_values=perturbation_data,
... )

Attributes

is_complex	Whether perturbation is complex valued.
perturbation_range	Range of possible parameter perturbation values.
perturbation_values
electron_range
hole_range
interp_method

Methods

compute_eh_ranges()	Compute and set electron and hole density ranges based on provided perturbation_values.
sample(electron_density, hole_density)	Sample perturbation at electron and hole density points.

perturbation_values

electron_range

hole_range

interp_method

property perturbation_range

Range of possible parameter perturbation values.

compute_eh_ranges()

Compute and set electron and hole density ranges based on provided perturbation_values.

sample(electron_density, hole_density)

Sample perturbation at electron and hole density points.

Parameters:

• electron_density (Union[) –

  ArrayFloat,

  SpatialDataArray, TriangularGridDataset, TetrahedralGridDataset,

  ] Electron density sample point(s).

• hole_density (Union[) –

  ArrayFloat,

  SpatialDataArray, TriangularGridDataset, TetrahedralGridDataset,

  ] Hole density sample point(s).

Note

Provided electron_density and hole_density must be of the same type and match shapes/coordinates, unless one of them is a scalar or both are 1d arrays, in which case values are broadcasted.

Returns:

• Union[ – ArrayFloat, ArrayComplex, SpatialDataArray, TriangularGridDataset, TetrahedralGridDataset,

• ] – Sampled perturbation value(s).

property is_complex

Whether perturbation is complex valued.