mie_tau

miepython.vsh.mie_tau(n, theta, deg=False)

Computes the angular variation of the electric field arising from the nth magnetic multipole 𝛕_n(𝜃).

The variation is given by the derivative of the nth associated Legendre polynomial d/d𝜃 P¹_n(cos𝜃)

Care is taken to avoid division by zero and for this function to work with both scalars and arrays.

Parameters:

• n – Degree of multipole 1=dipole, 2=quadrupole, 3=octopole

• theta – angle

• deg – if True then angle is in degrees

Returns:

array-like – Values of dP_n^m(x)/dx.