This work introduces a new method to model Fourier-limited two-level systems (TLS), or coherent emitters, within classical Maxwell solvers. The authors represent an individual emitter as a tiny, resonant spherical scatterer made from an artificial Drude metal, which naturally reproduces the ideal scattering cross-section and adapts to the local density of states. JCMsuite was used for all finite element method (FEM) simulations to solve Maxwell's equations and benchmark the proposed model against known examples from the literature, including scattering from hybrid systems and the Purcell effect.
F. Binkowski, S. Burger and G. Kewes. A tiny Drude scatterer can accurately model a coherent emitter in nanophotonics. Nanophotonics, 13, 4537–4543 (2024).