legume.GuidedModeExp.compute_rad_sp

GuidedModeExp.compute_rad_sp(kind, minds=[0])

Compute the radiation losses of the eigenmodes after the dispersion has been computed. Unlike GuidedModeExp.compute_rad(), this method separates the contribution form coupling to te-(s-) and tm-(p-)polarized radiative modes.

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.

• freqs_im_te (np.ndarray) – Imaginary part of the frequencies of the eigenmodes computed by the guided-mode expansion due to coupling to te (s) radiative mode

• freqs_im_tm (np.ndarray) – Imaginary part of the frequencies of the eigenmodes computed by the guided-mode expansion due to coupling to tm (p) radiative mode

• rad_coup (dict) – Coupling to te (s) and tm (p) radiative modes in the lower/upper cladding.

• rad_gvec (dict) – Reciprocal lattice vectors in the lower/upper cladding corresponding to rad_coup.