acoustotreams.ssw.periodic_to_spw

acoustotreams.ssw.periodic_to_spw(kx, ky, kz, l, m, area)[source]

Convert periodic scalar spherical waves into plane waves.

Return the coefficient for the basis change from spherical waves on a lattice to plane waves. For multiple positions, only the diagonal values (corresponding to identical positions) are returned. A correct phase factor is still necessary for the correct result.

Parameters:

  • kx (float or array_like) – X-component of the wave vector of plane waves.

  • ky (float or array_like) – Y-component of the wave vector of plane waves.

  • kz (float or complex or array_like) – Z-component of the wave vector of plane waves.

  • l (int or array_like) – Degree of spherical waves.

  • m (int or array_like) – Order of spherical waves.

  • area (float or array_like) – Unit cell area.

Returns:

complex