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This research demonstrates a fundamental breakthrough in photonic time crystals by achieving resonance-free surface-emitted microwave vortex beam lasing without traditional gain media or high-Q cavities. By utilizing a time-varying metamaterial with over 100% permittivity modulation depth, the team has overcome previous structural limitations to enable new capabilities for wireless communications and sensing systems using orbital angular momentum. This advancement represents significant progress in manipulating electromagnetic properties through temporal structuring rather than just spatial design.
Photonic Time Crystals Achieve 100% Permittivity Modulation Depth
Photonic time crystals (PTCs), artificially structured media with periodically varying electromagnetic properties in time, offer a paradigm shift toward resonance-free lasing without the need for gain media. Researchers report the first experimental demonstration of surface-emitted microwave vortex beam lasing using ring-shaped PTCs, achieving over 100% equivalent permittivity modulation depth.
Researchers have, for the first time, demonstrated surface-emitted microwave vortex beam lasing using ring-shaped photonic time crystals, a feat accomplished without relying on traditional amplification methods like gain media or high-Q cavities. The team, led by Xiangdong Zhang at…
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