acoustotreams.scw.translate_periodic

acoustotreams.scw.translate_periodic(k, kpar, a, rs, out, in_=None, rsin=None, eta=0)

Translation coefficients in a lattice.

Returns the translation coefficents for the given modes in a lattice. The calculation uses the fast converging sums of treams.lattice.

Parameters:

• k (float or complex) – Wave number in the medium

• kpar (float, (D,)-array) – Parallel component of the wave, defines the dimension with 1 <= D <= 2

• a (float, (D,D)-array) – Lattice vectors in each row of the array

• rs (float, (M, 3)-array) – Shift vectors with respect to one lattice point

• out (2- or 3-tuple of integer arrays) – Output modes

• in (2- or 3-tuple of integer arrays) – Input modes, if none are given equal to the output modes

• rsin (float) – Shift vectors to use with the input modes, if non are given equal to rs

• eta (float or complex, optional) – Cut between real and reciprocal space summation, if equal to zero, an estimation for the optimal value is done.

Returns:

complex array