treams.TMatrix.sphere

classmethod TMatrix.sphere(lmax, k0, radii, materials, poltype=None)

T-Matrix of a (multi-layered) sphere.

Construct the T-matrix of the given order and material for a sphere. The object can also consist of multiple concentric spherical shells with an arbitrary number of layers. The calculation is always done in helicity basis.

Parameters:

  • lmax (int) – Positive integer for the maximum degree of the T-matrix.

  • k0 (float) – Wave number in vacuum.

  • radii (float or array) – Radii from inside to outside of the sphere. For a simple sphere the radius can be given as a single number, for a multi- layered sphere it is a list of increasing radii for all shells.

  • material (list[Material]) – The material parameters from the inside to the outside. The last material in the list specifies the embedding medium.

  • poltype (str, optional) – Polarization type (Polarizations).

Returns:

TMatrix