Synthetic Spatiotemporal Plasmonic Vortices On Chip

Qian Chen; Shuoshuo Zhang; Guoyu Xian; Haoqiang Hu; Xiaohua Wu; Xiaofei Wu; Jer-Shing Huang; Chen-Bin Huang; Jin-Hui Zhong; Yuquan Zhang; Xiaocong Yuan; Changjun Min; Yanan Dai

arXiv · 2511.16155

Synthetic Spatiotemporal Plasmonic Vortices On Chip

Qian Chen·Shuoshuo Zhang·Guoyu Xian·Haoqiang Hu·Xiaohua Wu·Xiaofei Wu·Jer-Shing Huang·Chen-Bin Huang·Jin-Hui Zhong·Yuquan Zhang·Xiaocong Yuan·Changjun Min·Yanan Dai

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Abstract

Spatiotemporal vortices are polychromatic modes that intertwine orbital angular momentum (OAM) in space and time. Here we introduce a new class of such vortices, spatiotemporal plasmonic vortices (STPVs), carrying nontrivial topological spin textures. They are generated by chronotopic interference of temporally delayed plasmonic eigen-vortices, where a $\pi$-phase dislocation in the space-frequency domain maps into a 2$\pi$ spiraling phase in space-time, with the resulting focus-defocus dynamics emulate U(1) gauge transitions. Using interferometric time-resolved photoemission electron microscopy (ITR-PEEM), we directly image their nanometer-attosecond (nano-atto) evolution and control vortex number and position. Quantum-path analysis of coherent two-photon photoemission (2PP) processes reveals the nonlinear plasmonic polarization fields and angular-momentum conservation, establishing STPVs as a platform for probing spatiotemporally structured quantum matter.

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Qian Chen, Shuoshuo Zhang, Guoyu Xian, Haoqiang Hu, Xiaohua Wu, Xiaofei Wu, Jer-Shing Huang, Chen-Bin Huang, Jin-Hui Zhong, Yuquan Zhang, Xiaocong Yuan, Changjun Min, Yanan Dai. 2025-11-20. Synthetic Spatiotemporal Plasmonic Vortices On Chip. https://arxiv.org/abs/2511.16155

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