treams.misc.refractive_index

treams.misc.refractive_index(epsilon=1, mu=1, kappa=0)

Refractive index of a (chiral) medium.

The refractive indeces in a chiral medium \(\sqrt{\epsilon\mu} \mp \kappa\) are returned with the negative helicity result first.

Parameters:

• epsilon (float or complex, array_like, optional) – Relative permittivity, defaults to 1.

• mu (float or complex, array_like, optional) – Relative permeability, defaults to 1.

• kappa (float or complex, array_like, optional) – Chirality parameter, defaults to 0.

Returns:

float or complex, (2,)-array