coefficients

deeptrack.backend.mie.coefficients(m: float | complex, a: float, L: int) → Tuple[ndarray, ndarray]

Calculate the Mie scattering coefficients for a spherical particle.

These coefficients are used in the computation of the scattering and absorption of light by the particle. The terms up to (and including) order L are calculated using Riccati-Bessel polynomials.

Parameters

mfloat or complex

The relative refractive index of the particle n_particle / n_medium.

afloat

The radius of the particle (> 0).

Lint

The maximum order of the spherical harmonics to be calculated.

Returns

Tuple[np.ndarray, np.ndarray]

A tuple containing two arrays of complex numbers, A and B, which are the Mie scattering coefficients up to (and including) order L.