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Harnessing the Natural Resonances of Time-Varying Dispersive Interfaces
Carlo Rizza1, Maria Antonietta Vincenti2, Giuseppe Castaldi3
1Department of Physical and Chemical Sciences, <a href="https://ror.org/01j9p1r26">University of L'Aquila</a>, I-67100 L'Aquila, Italy.
Abstract:
Space-time modulation of electromagnetic parameters offers novel exciting possibilities for advanced field manipulations. In this study, we explore wave scattering from a time-varying interface characterized by a Lorentz-type dispersion with a steplike temporal variation in its parameters. Our findings reveal a new process: an unconventional frequency generation at the natural resonances of the system. Remarkably, this phenomenon enables the coupling of propagating waves to evanescent ones, allowing the direct far-field excitation of surface-wave modes without the mediation of spatial gratings or prisms. These results suggest a novel strategy for designing compact and ultrafast photonic devices, eliminating the necessity for subwavelength spatial structuring or prolonged temporal modulations.
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