Near-Fields Computation and Visualization

This example demonstrates the process of computing and visualizing the far-fields of a scatterer using PyMieSim.

Computing scattered near field component: Ex
/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/site-packages/PyMieSim/single/representations/nearfields.py:259: UnitStrippedWarning: The unit of the quantity is stripped when downcasting to ndarray.
  fields[component] = numpy.asarray(values).reshape(self.X.shape)

<Figure size 1200x600 with 4 Axes>

from PyMieSim.units import ureg

from PyMieSim.single.scatterer import Sphere
from PyMieSim.single.source import Gaussian
from PyMieSim.polarization import PolarizationState
from PyMieSim.single.setup import Setup

polarization_state = PolarizationState(angle=0 * ureg.degree)


source = Gaussian(
    wavelength=300 * ureg.nanometer,
    polarization=polarization_state,
    optical_power=1 * ureg.watt,
    numerical_aperture=0.3,
)

scatterer = Sphere(
    diameter=400 * ureg.nanometer,
    material=(1.4 + 5.j),
    medium=1.,
)

setup = Setup(
    scatterer=scatterer,
    source=source,
)

near_field = setup.get_representation("nearfields")

near_field.plot(
    "Ex:real",
    "Ex:abs",
    type="scattered",
    plane_origin=(0.0, 0.0, 0.0),
    plane_normal=(0.0, 1.0, 0.0),
    sampling=100,
    extent_scale=4,
    tight_layout=True,
)