thin_film.optimization.operand.thin_film

Thin Film Operand Module

This module contains the ThinFilmOperand class with static methods for computing reflectance, transmittance, and absorptance values for thin film stacks. These operands are designed to work with the optimization framework.

Corentin Nannini, 2025

Classes

ThinFilmOperand()

Operand functions for thin film stack optimization.

class ThinFilmOperand

Operand functions for thin film stack optimization.

This class provides static methods that compute optical properties (reflectance, transmittance, absorptance) of thin film stacks. These methods are designed to be used as operand functions in the optimization framework.

static absorptance(stack: ThinFilmStack, wavelength_nm: float | list[float], aoi_deg: float = 0.0, polarization: str = 'u') → float

Compute absorptance for optimization.

Parameters:

• stack – The thin film stack to analyze.

• wavelength_nm – Wavelength(s) in nanometers.

• aoi_deg – Angle of incidence in degrees. Defaults to 0.0.

• polarization – Polarization state (‘s’, ‘p’, ‘u’). Defaults to ‘u’.

Returns:

The absorptance value. If multiple wavelengths are provided,

returns the mean absorptance.

Return type:

float

static absorptance_weighted(stack: ThinFilmStack, wavelengths_nm: list[float], weights: list[float], aoi_deg: float = 0.0, polarization: str = 'u') → float

Compute weighted absorptance over multiple wavelengths.

Parameters:

• stack – The thin film stack to analyze.

• wavelengths_nm – List of wavelengths in nanometers.

• weights – List of weights for each wavelength.

• aoi_deg – Angle of incidence in degrees. Defaults to 0.0.

• polarization – Polarization state (‘s’, ‘p’, ‘u’). Defaults to ‘u’.

Returns:

The weighted absorptance value.

Return type:

float

static reflectance(stack: ThinFilmStack, wavelength_nm: float | list[float], aoi_deg: float = 0.0, polarization: str = 'u') → float

Compute reflectance for optimization.

Parameters:

• stack – The thin film stack to analyze.

• wavelength_nm – Wavelength(s) in nanometers.

• aoi_deg – Angle of incidence in degrees. Defaults to 0.0.

• polarization – Polarization state (‘s’, ‘p’, ‘u’). Defaults to ‘u’.

Returns:

The reflectance value. If multiple wavelengths are provided,

returns the mean reflectance.

Return type:

float

static reflectance_weighted(stack: ThinFilmStack, wavelengths_nm: list[float], weights: list[float], aoi_deg: float = 0.0, polarization: str = 'u') → float

Compute weighted reflectance over multiple wavelengths.

Parameters:

• stack – The thin film stack to analyze.

• wavelengths_nm – List of wavelengths in nanometers.

• weights – List of weights for each wavelength.

• aoi_deg – Angle of incidence in degrees. Defaults to 0.0.

• polarization – Polarization state (‘s’, ‘p’, ‘u’). Defaults to ‘u’.

Returns:

The weighted reflectance value.

Return type:

float

static transmittance(stack: ThinFilmStack, wavelength_nm: float | list[float], aoi_deg: float = 0.0, polarization: str = 'u') → float

Compute transmittance for optimization.

Parameters:

• stack – The thin film stack to analyze.

• wavelength_nm – Wavelength(s) in nanometers.

• aoi_deg – Angle of incidence in degrees. Defaults to 0.0.

• polarization – Polarization state (‘s’, ‘p’, ‘u’). Defaults to ‘u’.

Returns:

The transmittance value. If multiple wavelengths are provided,

returns the mean transmittance.

Return type:

float

static transmittance_weighted(stack: ThinFilmStack, wavelengths_nm: list[float], weights: list[float], aoi_deg: float = 0.0, polarization: str = 'u') → float

Compute weighted transmittance over multiple wavelengths.

Parameters:

• stack – The thin film stack to analyze.

• wavelengths_nm – List of wavelengths in nanometers.

• weights – List of weights for each wavelength.

• aoi_deg – Angle of incidence in degrees. Defaults to 0.0.

• polarization – Polarization state (‘s’, ‘p’, ‘u’). Defaults to ‘u’.

Returns:

The weighted transmittance value.

Return type:

float