Generating and Weaving Topological Event Wavepackets in Photonic Spacetime Crystals with Fully Energy-Momentum Gapped
Generating and Weaving Topological Event Wavepackets in Photonic Spacetime Crystals with Fully Energy-Momentum Gapped
We propose a novel type of topological excitation topological event wavepackets (TEWs) emerging in photonic spacetime crystals (STCs) with spacetime modulated dielectric constants. These TEWs exhibit strong spatiotemporal localization and are topologically protected by a fully opened energy momentum (Ïk) gap, within which conventional steady states are absent. We further demonstrate that TEWs are spectrally confined within the Ïk-gap, providing a combined measurement for probing the emergence of TEW and the Ïk-gap size. Furthermore, we construct a spacetime winding number to elucidate the protection of these events. Unlike previously reported nolinearity-induced event solitons, TEWs originate from topological configuration for linear media, thereby more accessible and versatile for experimental realization. Moreover, we show that TEWs can be periodically woven to form an event lattice, enabling to suppress unwanted noise amplification. Our findings open a new pathway toward topological control in photonic spacetime-modulated systems, enabling the Ïk-gap band enginering for wave manipulation ranging from microwave to optical regimes.
Liang Zhang、Zirui Zhao、Qiaofei Pan、Chenhao Pan、Qingqing Cheng、Yiming Pan
物理学光电子技术
Liang Zhang,Zirui Zhao,Qiaofei Pan,Chenhao Pan,Qingqing Cheng,Yiming Pan.Generating and Weaving Topological Event Wavepackets in Photonic Spacetime Crystals with Fully Energy-Momentum Gapped[EB/OL].(2025-07-21)[2025-08-18].https://arxiv.org/abs/2507.15309.点此复制
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