tidy3d.EMELengthSweep

class EMELengthSweep

Bases: EMESweepSpec

Spec for sweeping EME cell lengths.

Parameters:

scale_factors (ArrayLike) – Length scale factors to be used in the EME propagation step. The EME propagation step is repeated after scaling every cell length by this amount. The results are stored in ‘sim_data.smatrix’. If a 2D array is provided, the first index is the sweep index and the second index is the cell index, allowing a nonuniform cell scaling along the propagation axis.

Notes

Varies the lengths of EME cells without re-solving modes. This is useful for optimizing device length, since only the propagation phase accumulated within each cell changes. If a 2D array is provided for scale_factors, different cells can be scaled independently at each sweep index.

For bent EME cells, this reuse remains valid only if the local mode problem is unchanged. In particular, bent anisotropic cells are rejected when changing the cell lengths would change the absolute tensor orientation seen by a reused mode, and bent custom media are only supported when no global-frame remapping of custom data is required.

Example

>>> sweep_spec = EMELengthSweep(scale_factors=[0.5, 1.0, 1.5, 2.0])

Attributes

num_sweep	Number of sweep indices.
sweep_cells	Whether the sweep changes the propagation within a cell.
scale_factors

scale_factors

property num_sweep

Number of sweep indices.

property sweep_cells

Whether the sweep changes the propagation within a cell.