Statistical regimes of electromagnetic wave propagation in randomly time-varying media

Abstract: Wave propagation in time-varying media enables unique control of energy transport by breaking energy conservation through temporal modulation. Among the resulting phenomena, temporal disorder-random fluctuations in material parameters-can suppress propagation and induce localization, analogous to Anderson localization. However, the statistical nature of this process remains incompletely understood. We present a comprehensive analytical and numerical study of electromagnetic waves in spatially uniform media with randomly time-varying permittivity. Using the invariant imbedding method, we derive exact moment equations and identify three distinct statistical regimes for initially unidirectional input: gamma-distributed energy at early times, exponential behavior at intermediate times, and a quasi-log-normal distribution at long times. In contrast, symmetric bidirectional input yields true log-normal statistics across all time scales. These findings are validated by extensive calculations using two complementary disorder models-delta-correlated Gaussian noise and piecewise-constant fluctuations-demonstrating that the observed statistics are robust and governed by input symmetry and temporal dynamics. Momentum conservation further constrains long-term behavior, linking initial conditions to energy growth. Our results establish a unified framework for understanding statistical wave dynamics in time-modulated systems and offer guiding principles for the design of dynamically tunable photonic and electromagnetic devices.