New Electromagnetic Modes in Space-Time Modulated Dispersion-Engineered Media

Abstract

We report on new electromagnetic modes in space-time modulated dispersion-engineered media. These modes exhibit unusual dispersion relation, field profile and scattering properties. They are generated by coupled codirectional space-time harmonic pairs, and occur in space-time periodic media whose constituent materials exhibit specific dispersion. Excitation of a slab of such a medium with subluminal modulation results in periodic transfer of energy between the incident frequency and a frequency shifted by a multiple of the modulation frequency, whereas superluminal modulation generates exponentially growing frequencies. These modes may find applications in optical mixers, terahertz sources and other optical devices.

References in corpus (3)

• Non-Reciprocal Wave Propagation in Spatiotemporal Periodic Structures
• Nonreciprocal Electromagnetic Scattering from a Periodically Space-Time Modulated Slab and Application to a Quasisonic Isolator
• Optical Isolation based on Space-time Engineered Asymmetric Photonic Bandgaps

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• Beyond the Rozanov Bound on Electromagnetic Absorption via Periodic Temporal Modulations
• Non-reciprocity using quadrature-phase time-varying slab resonators
• Non-Bloch Theory for Spatiotemporal Photonic Crystals Assisted by Continuum Effective Medium
• Broadband Dipole Absorption in Dispersive Photonic Time Crystals
• Cavity quantum electrodynamics of photonic temporal crystals
• Spontaneous emission decay and excitation in photonic time crystals
• Spacetime Metamaterials
• Revealing non-Hermitian band structures of photonic Floquet media