InfiniteCylinder: Qsca vs Index

This example demonstrates how to compute and visualize the scattering efficiency (Qsca) as a function of refractive index for cylindrical scatterers using PyMieSim, considering multiple wavelengths.

Result dimensions and shape: ('measure', 'source:wavelength', 'scatterer:material') (2, 3, 1500)
Measure units: {'Qsca': <Unit('dimensionless')>, 'Qext': <Unit('dimensionless')>}
/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/matplotlib/cbook.py:1719: ComplexWarning: Casting complex values to real discards the imaginary part
  return math.isfinite(val)
/opt/hostedtoolcache/Python/3.11.17/x64/lib/python3.11/site-packages/matplotlib/cbook.py:1355: ComplexWarning: Casting complex values to real discards the imaginary part
  return np.asarray(x, float)

import numpy as np
from PyMieSim import (
    Measure,
    ureg,
    InfiniteCylinderSet,
    GaussianSet,
    PolarizationSet,
    Experiment,
)


polarization_set = PolarizationSet(
    angles=[30.0] * ureg.degree,
)

source = GaussianSet(
    wavelength=[500, 1000, 1500] * ureg.nanometer,
    polarization=polarization_set,
    optical_power=[1e-3] * ureg.watt,
    numerical_aperture=[0.2],
)

scatterer = InfiniteCylinderSet(
    diameter=[800] * ureg.nanometer,
    material=np.linspace(1.3, 1.9, 1500),
    medium=[1.0],
)

experiment = Experiment(scatterer_set=scatterer, source_set=source)

result = experiment.get(Measure.QSCA, Measure.QEXT)

print("Result dimensions and shape:", result.dims, result.shape)
print("Measure units:", result.attrs["units"])

result.plot(x="scatterer:material", y="Qsca")