pwspy.utility.reflection.multilayerReflectanceEngine.NonPolarizedStack

class pwspy.utility.reflection.multilayerReflectanceEngine.NonPolarizedStack(wavelengths, elements=None)

Bases: pwspy.utility.reflection.multilayerReflectanceEngine.StackBase

Represents a stack of 1d homogenous films. Reflectance can only be calculated at 0 incidence angle in which case polarization is irrelevant. This class does not do anything that can’t be done with Stack. Indices of refraction must be real (no absorption).

Parameters

• wavelengths (Union[Number, ndarray]) – The wavelengths that calculation should operate over.

• elements (Optional[List[Layer]]) – The initial layers to add to the stack.

addLayer(element)

Add a new Layer to the Stack

Parameters

element (Layer) – A new layer to add.

calculateReflectance()

Calculate the reflectance for this Stack.

Return type

ndarray

Returns

The reflectance.

static interfaceMatrix(n1, n2)

Generate a matrix representing the interface between two dielectrics with indices n1 on the left and n2 on the right. Actually the order of terms does not appear to matter. This does not account for polarization or incidence angles other than 0 degrees.

Parameters

• n1 (Series) – The refractive indices on one side of the reflective interface

• n2 (Series) – The refractive indices on the other side of the reflective interface

Return type

ndarray

Returns

A transfer matrix for the reflective interface

plot()

Open a Matplotlib plot of the stack.

static propagationMatrix(n, d)

Returns a matrix representing the propagation of light. n should be a pandas Series where the values are complex refractive index and the index fo the Series is the associated wavelengths. with wavelength. for a distance of d. d and the wavelengths must use the same units.

Parameters

• n (Series) – The refractive indices of the material

• d (float) – The distance of propagation.

Return type

ndarray

Returns

A transfer matrix for propagation through a material.