- Brendel oscillator
- Cauchy
- Cody-Lorentz
- Drude-Lorentz oscillator
- Effective medium and index gradient
- Extended Drude
- Formula
- Forouhi-Bloomer
- Hamberg
- Harmonic oscillator
- Sellmeier
- Sernelius
- Spectrum combination
- Tanguy
- Tauc-Lorentz
- Uniaxial & biaxial anisotropic and others