Sphere Particles: 0

# Standard library imports
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from PyMieSim.units import ureg

# PyMieSim imports
from PyMieSim.experiment.scatterer import SphereSet
from PyMieSim.experiment.source import GaussianSet, PolarizationSet
from PyMieSim.experiment import Setup
from PyMieSim.directories import validation_data_path


# Define parameters
wavelength = 632.8 * ureg.nanometer  # Wavelength of the light source in meters
polarization = PolarizationSet(angles=0 * ureg.degree)
optical_power = 1e-3 * ureg.watt  # Power in watts
NA = 0.2 * ureg.AU  # Numerical aperture
medium_index = 1.21 * ureg.RIU
index = 1.4 * ureg.RIU
diameters = (
    np.geomspace(10, 1_000, 50) * ureg.nanometer
)  # Geometric space for diameters

# Setup source
source = GaussianSet(
    wavelength=[632.8] * ureg.nanometer,
    polarization=polarization,
    optical_power=[1e-3] * ureg.watt,
    numerical_aperture=[0.2] * ureg.AU,
)

# Setup scatterer
scatterer = SphereSet(
    diameter=diameters,
    refractive_index=[1.4] * ureg.RIU,
    medium_refractive_index=[1.21] * ureg.RIU,
    source=source
)

# Define experiment setup
experiment = Setup(scatterer=scatterer, source=source)

comparison_measures = ["Qsca", "Qext", "Qabs", "g", "Qpr", "Qback"]

# Simulate using PyMieSim
pymiesim = experiment.get(*comparison_measures, as_numpy=True)

pymiescatt_dataframe = pd.read_csv(
    validation_data_path / "pymiescatt/example_shpere_0.csv"
)

# Plot results
figure, ax = plt.subplots(1, 1)

pymiescatt_dataframe.diameter *= 1e9

ax.set(
    xlabel="Diameter [nm]",
    ylabel="Scattering Efficiencies",
    title="Scattering parameters Comparison for Sphere Particles",
)

for string in comparison_measures:
    ax.plot(
        pymiescatt_dataframe["diameter"],
        pymiescatt_dataframe[string],
        label="PyMieScatt: " + string,
        linewidth=3,
    )

for data, string in zip(pymiesim, comparison_measures):
    ax.plot(
        diameters.to(ureg.nanometer).magnitude,
        data,
        label="PyMieSim: " + string,
        linestyle="--",
        color="black",
        linewidth=1.5,
    )

plt.legend()
plt.show()