N_odd_array

miepython.vsh.N_odd_array(n, lambda0, d_sphere, m_index, r, theta, phi)

Generate first n odd electric vector spherical harmonics (m=1).

The units of lambda0, d_sphere, and r should be the same (e.g., microns).

The conventions used follow the “Vector Spherical Harmonics” Wikipedia page and Ladutenko’s paper (DOI: https://doi.org/10.1016/j.cpc.2017.01.017).

Parameters:

• n (int) – Harmonic (1 for dipole, 2 for quadrupole, etc.).

• lambda0 (float) – Wavelength in a vacuum.

• d_sphere (float) – Diameter of the sphere.

• m_index (complex) – Refractive index at position r.

• r (float) – Radial distance from center of sphere.

• theta (float) – Polar angle in radians (angle from z-axis).

• phi (float) – Azimuthal angle in radians. (angle from x-axis).

Returns:

tuple – [N_r, N_theta, N_phi] where each is an array