.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/scattering/04_refractive_index.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_scattering_04_refractive_index.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_scattering_04_refractive_index.py:


Effect of optical contrast
==========================

Change the sphere refractive index at fixed diameter, wavelength, and medium.
The resulting cross sections describe isolated spheres, without structural
correlations between particles.

.. GENERATED FROM PYTHON SOURCE LINES 9-35



.. image-sg:: /gallery/scattering/images/sphx_glr_04_refractive_index_001.png
   :alt: Optical contrast in a medium of index 1.33
   :srcset: /gallery/scattering/images/sphx_glr_04_refractive_index_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    import matplotlib.pyplot as plt
    import numpy as np
    from PackLab import scattering, ureg

    indices = [1.36, 1.42, 1.50, 1.59, 1.70]
    cross_sections = []
    for index in indices:
        dataset = scattering.compute_scattering_amplitudes(
            wavelength=532 * ureg.nanometer,
            diameters=np.array([200]) * ureg.nanometer,
            material=index,
            medium=1.33,
            phi=np.linspace(-90, 90, 181) * ureg.degree,
        )
        dataset.process()
        cross_sections.append(dataset.Csca.to("nanometer**2").magnitude[0])
    figure, axis = plt.subplots()
    axis.plot(indices, cross_sections, "o-")
    axis.set(
        xlabel="sphere refractive index",
        ylabel="scattering cross section (nm²)",
        title="Optical contrast in a medium of index 1.33",
    )
    axis.grid(alpha=0.2)
    figure.tight_layout()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.068 seconds)


.. _sphx_glr_download_gallery_scattering_04_refractive_index.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: 04_refractive_index.ipynb <04_refractive_index.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: 04_refractive_index.py <04_refractive_index.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: 04_refractive_index.zip <04_refractive_index.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_