Nonlinear Lorentz model for the description of nonlinear optical dispersion in nanophotonics simulations [Invited]

The Lorentz model provides a simple and intuitive approach to linear optical dispersion. In this paper, we present a nonlinear formulation of the Lorentz model based on an analytical solution of a quantum-mechanical two-level model atom in the under-resonant limit and show how multiple nonlinear Lorentz equations can be combined to describe nonlinear optical dispersion in both time and frequency domain nanophotonics simulations. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement