First experimental observation of a full (infinite) momentum bandgap spanning all momenta in a photonic time crystal, achieved via resonant enhancement in two modulated microwave metamaterial platforms.
Photonic time crystals assisted by quasi-bound states in the continuum
5 Pith papers cite this work. Polarity classification is still indexing.
5
Pith papers citing it
abstract
Photonic time crystals are a class of artificial materials that have only recently been explored. They are characterized by the ultrafast modulation of the material properties in time, causing a momentum bandgap for light that propagates through such novel states of matter. However, the observation of these unique properties at optical frequencies remains elusive, as the necessary modulation amplitudes of the permittivity to show notable momentum bandgaps are relatively high, inaccessible with available materials. While it has been known that structuring photonic time crystals at the sub-wavelength scale can enhance the momentum bandgap, we push this concept to the extreme by leveraging the nanophotonic toolbox. Specifically, we demonstrate that nanophotonic structures composed of scatterers supporting quasi-bound states in the continuum can significantly reduce the required amplitude of temporal permittivity modulation by enhancing the interaction time between light and time-varying matter. This allows us to observe extremely wide momentum bandgaps despite the material properties having tiny modulation amplitudes. Our approach bridges the concepts of bound states in the continuum and time-varying metamaterials, paving the way toward realizable photonic time crystals at optical frequencies.
fields
physics.optics 5years
2026 5representative citing papers
Exploiting Fabry-Perot and symmetry-protected BICs in multilayered time-varying metasurfaces enables polarization-insensitive scattering anomalies and monochromatic nonreciprocal transmission at perturbative modulation amplitudes.
Time-modulated metasurface waveguides enable multimode photonic time crystals with intramodal and tilted intermodal band gaps that support directional amplification and symmetry-based gap control.
A first-order Born theory maps time-modulated scattering amplitudes directly to static-mode overlap integrals, enabling modal control of inelastic channels in dielectric resonators.
Time-modulated permittivity in an infinite cylinder produces phase-tunable angular scattering including parametric amplification and directional control or cancellation.
citing papers explorer
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Observation of full momentum bandgap in photonic time crystals
First experimental observation of a full (infinite) momentum bandgap spanning all momenta in a photonic time crystal, achieved via resonant enhancement in two modulated microwave metamaterial platforms.
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Bound states in the continuum in multilayered time-varying metasurfaces
Exploiting Fabry-Perot and symmetry-protected BICs in multilayered time-varying metasurfaces enables polarization-insensitive scattering anomalies and monochromatic nonreciprocal transmission at perturbative modulation amplitudes.
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Multi-mode Photonic Time Crystals Based on Time-Modulated Metasurface Waveguides
Time-modulated metasurface waveguides enable multimode photonic time crystals with intramodal and tilted intermodal band gaps that support directional amplification and symmetry-based gap control.
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Perturbative Born theory for light scattering by time-modulated scatterers
A first-order Born theory maps time-modulated scattering amplitudes directly to static-mode overlap integrals, enabling modal control of inelastic channels in dielectric resonators.
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Taming the single-cylinder scattering through time-modulation -- The role of the modulation phase
Time-modulated permittivity in an infinite cylinder produces phase-tunable angular scattering including parametric amplification and directional control or cancellation.