legume.GuidedModeExp.compute_rad

GuidedModeExp.compute_rad(kind: int, minds: list = [0])

Compute the radiation losses of the eigenmodes after the dispersion has been computed.

Parameters:

• kind (int) – Index of the k-point for the computation.
• minds (list, optional) – Indexes of which modes to be computed. Max value must be smaller than GuidedModeExp.numeig set in GuidedModeExp.run().

Returns:

• freqs_im (np.ndarray) – Imaginary part of the frequencies of the eigenmodes computed by the guided-mode expansion.
• rad_coup (dict) – Coupling to TE and TM radiative modes in the lower/upper cladding.
• rad_gvec (dict) – Reciprocal lattice vectors in the lower/upper cladding corresponding to rad_coup.