Generalized Maxwell projections for multi-mode network Photonics

The design of optical resonant systems for controlling light at the nanoscale is an exciting field of research in nanophotonics. While describing the dynamics of systems with few resonances is a relatively well understood problem, controlling the behavior of systems with many overlapping states is considerably more difficult. In this work we formulate a form of time dependent coupled mode theory based on complete and orthogonal modes, which project Maxwell's dynamics into a set of spatio-temporal equations that retain both the simplicity and the exactness of traditional coupled mode theory studied for optical waveguides. We developed a fast and effective computational method that extracts all the characteristics of a multi-mode resonant system, including the full density of states, the modes quality factors, the mode resonances and linewidths from a single first principle simulation. This approach can be used to study both analytically and numerically the complex dynamics of systems with many overlapping resonances in ensembles of resonators of any geometrical shape defined in materials with arbitrary responses.

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