# tidy3d.Sellmeier¶

class tidy3d.Sellmeier(coeffs, name=None)

Sellmeier dispersion refractive index model.

__init__(coeffs, name=None)

Define a material with Sellmeier dispersion.

Parameters

coeffs (list, of the form [($$B_0, C_0$$), …]) –

The dispersion formula is:

$n^2 - 1 = \sum_p \frac{B_p \lambda^2}{\lambda^2 - C_p}$

where $$\lambda$$ is in microns.

Methods

 __init__(coeffs[, name]) Define a material with Sellmeier dispersion. epsilon([freqs, component]) Evaluate the (complex) relative permittivity of the medium. from_dn(wl, n, dn_dwl[, name]) Create a 1-pole Sellmeier model from dispersion data.