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This research establishes a rigorous framework for fluctuational quantum electrodynamics in dispersive and lossy media that operates beyond standard perturbation theory. By deriving a generalized Fermi Golden Rule for time-varying systems, it enables precise modeling of light-matter interactions, thermal radiation correlations, and phenomena like the dynamical Casimir effect without relying on approximations limited to small temporal modulations.
Fluctuational Quantum Electrodynamics Accounts for Lossy Media
This work develops the formalism of fluctuational quantum electrodynamics for frequency-dispersive and dissipative time-varying media, accounting for the dispersive and lossy nature of the temporal modulation without perturbative methods. A generalized Fermi Golden Rule is derived, allowing definition of the local density of states for these time-dependent systems.
Jaime E. Sustaeta-Osuna, Thomas F. Allard, Francisco J. García-Vidal, and Paloma A. Huidobro of Universidad Autónoma de Madrid have developed a new framework for understanding how light and matter interact in materials with changing properties. Their work details a generalized Fermi Golden Rule specifically designed for media that evolve over time, moving beyond calculations that previously treated the temporal modulation as a perturbation. The researchers modeled two distinct geometries, a periodically driven polar insulator and a plasmonic medium, as examples after developing the theory.…
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