Revision

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for `.gz` files in `Simulation` version updater.
 - Warning if a nonuniform custom medium is intersecting `PlaneWave`, `GaussianBeam`, `AstigmaticGaussianBeam`, `FieldProjectionCartesianMonitor`, `FieldProjectionAngleMonitor`, `FieldProjectionKSpaceMonitor`, and `DiffractionMonitor`.
 - Tidy3D objects may store arbitrary metadata in an `.attrs` dictionary.
+- Convenience method `constant_loss_tangent_model` in `FastDispersionFitter` to fit constant loss tangent material model.
+- Classmethods in `DispersionFitter` to load complex-valued permittivity or loss tangent data.
 
 ### Changed
 

tidy3d/components/medium.py

@@ -763,6 +763,7 @@ def nk_model(self, frequency: float) -> Tuple[float, float]:
         ----------
         frequency : float
             Frequency to evaluate permittivity at (Hz).
+
         Returns
         -------
         Tuple[float, float]
@@ -778,6 +779,7 @@ def loss_tangent_model(self, frequency: float) -> Tuple[float, float]:
         ----------
         frequency : float
             Frequency to evaluate permittivity at (Hz).
+
         Returns
         -------
         Tuple[float, float]

tidy3d/plugins/dispersion/fit.py

@@ -706,18 +706,19 @@ def from_complex_permittivity(
         eps_imag: ArrayFloat1D = None,
         wvl_range: Tuple[Optional[float], Optional[float]] = (None, None),
     ):
-        """Loads :class:`DispersionFitter` from wavelength and complex permittivity data
+        """Loads :class:`DispersionFitter` from wavelength and complex relative permittivity data
 
         Parameters
         ----------
         wvl_um : ArrayFloat1D
             Wavelength data in micrometers.
         eps_real : ArrayFloat1D
-            Real parts of permittivity data
+            Real parts of relative permittivity data
         eps_imag : Optional[ArrayFloat1D]
-            Imageinary parts of permittivity data; `None` for lossless medium.
+            Imaginary parts of relative permittivity data; `None` for lossless medium.
         wvg_range : Tuple[Optional[float], Optional[float]]
             Wavelength range [wvl_min,wvl_max] for fitting.
+
         Returns
         -------
         :class:`DispersionFitter`
@@ -744,11 +745,12 @@ def from_loss_tangent(
         wvl_um : ArrayFloat1D
             Wavelength data in micrometers.
         eps_real : ArrayFloat1D
-            Real parts of permittivity data
+            Real parts of relative permittivity data
         loss_tangent : Optional[ArrayFloat1D]
             Loss tangent data, defined as the ratio of imaginary and real parts of permittivity.
-        wvg_range : Tuple[Optional[float], Optional[float]]
+        wvl_range : Tuple[Optional[float], Optional[float]]
             Wavelength range [wvl_min,wvl_max] for fitting.
+
         Returns
         -------
         :class:`DispersionFitter`