Few-Mode Field Quantization of Arbitrary Electromagnetic Spectral Densities

We develop a framework that provides few-mode master equation description of the interaction between single quantum emitter and an arbitrary electromagnetic environment. The field quantization requires only fitting spectral density, obtained through classical simulations, to model system involving small number lossy interacting modes. illustrate power validity our approach by describing population electric spatial dynamics in spontaneous decay placed complex hybrid plasmonic-photonic structure.