fdtdx.DrudePole

fdtdx.DrudePole#

class fdtdx.DrudePole(*, orientation=None, plasma_frequency=null, damping=null)[source]#

Bases: Pole

Drude pole parameterised by its physical constants.

The contribution to the susceptibility is

\[\chi(\omega) = -\frac{\omega_p^2}{\omega^2 + i\gamma\omega},\]

equivalent to a Lorentz pole with omega_0 = 0.

Each parameter is either a scalar (isotropic) or a per-axis 3-tuple (x, y, z) for diagonally anisotropic dispersion — e.g. plasma_frequency=(wp, 0.0, 0.0) gives a metallic (hyperbolic) response only along x.

Quick Reference#

Attributes

Methods

Attributes#

DrudePole.coupling_sq#

Effective squared coupling frequency K (rad^2/s^2).

Raises ValueError for per-axis poles; use coupling_sq_axes.

DrudePole.coupling_sq_axes#
DrudePole.damping: float | tuple[float, float, float]#

Damping rate (rad/s). Must be >= 0. Scalar or per-axis 3-tuple.

DrudePole.gamma#

Damping rate (rad/s).

Raises ValueError for per-axis poles; use gamma_axes.

DrudePole.gamma_axes#
DrudePole.is_isotropic#

Whether the pole acts identically on the three axes (and is not oriented).

DrudePole.is_oriented#

Whether the pole is a 1D oscillator along an orientation vector.

DrudePole.omega_0#

Resonance angular frequency (rad/s). Zero for pure Drude poles.

Raises ValueError for per-axis poles; use omega_0_axes.

DrudePole.omega_0_axes#
DrudePole.orientation: tuple[float, float, float] | None#

Optional oscillator direction u (normalized on construction). None (default) applies the pole isotropically or per-axis. When set, the pole is a single 1D oscillator along u with coupling tensor K * u u^T; all other pole parameters must be scalars.

DrudePole.plasma_frequency: float | tuple[float, float, float]#

Plasma angular frequency (rad/s). Must be > 0. Scalar or per-axis 3-tuple.

Methods#

DrudePole.aset(attr_name, val, create_new_ok=False)#

Sets an attribute of this class. In contrast to the classical .at[].set(), this method updates the class attribute directly and does not only operate on jax pytree leaf nodes. Instead, replaces the full attribute with the new value.

The attribute can either be the attribute name of this class, or for nested classes it can also be the attribute name of a class, which itself is an attribute of this class. The syntax for this operation could look like this: “a->b->[0]->[‘name’]”. Here, the current class has an attribute a, which has an attribute b, which is a list, which we index at index 0, which is an element of type dictionary, which we index using the dictionary key ‘name’.

Note that dictionary keys cannot contain square brackets or single quotes (even if they are escaped).

Parameters:

  • attr_name (str) – Name of attribute to set

  • val (Any) – Value to set the attribute to

  • create_new_ok (bool, optional) – If false (default), throw an error if the attribute does not exist. If true, creates a new attribute if the attribute name does not exist yet.

Returns:

Updated instance with new attribute value

Return type:

Self

DrudePole.get_class_fields()#
Return type:

list[TreeClassField]

DrudePole.get_public_fields()#
Return type:

list[TreeClassField]

If you find any errors in the documentation, please report them in the Github Issues!