Chongfan Technology
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22
2026
-
06
Dynamic Topological Metasurfaces Based on Mobile Singularities
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The teams of Zhen Tian and Chunmei Ouyang at Tianjin University, together with Tun Cao at Dalian University of Technology, have proposed and experimentally demonstrated a reconfigurable topological metasurface in the terahertz regime. This metasurface leverages the phase transition of Ge–Sb–Te (GST) to induce deterministic shifts of exceptional points. The authors show that the amorphous-to-crystalline transition triggers a discrete reshaping of the radiation continuum’s edge, enabling switching between transmission and reflection modes and fundamentally altering the system’s coupling matrix. By combining this tunable topological phase with an orientation‑dependent Pancharatnam–Berry (PB) phase, they realize on a substrate‑free platform an active wavefront‑manipulation scheme that decouples spin degrees of freedom. The device can dynamically switch a left‑handed circularly polarized channel from a near‑field plasmonic meta‑lens to a far‑field orbital angular momentum (OAM) generator (l = 2), while maintaining a topologically trivial and stable response to right‑handed circular polarization. This work bridges the gap between active non-Hermitian physics and integrated terahertz photonics, paving the way for adaptive sensing and 6G communication systems.
The research findings were published on June 15, 2026, in Laser & Photonics Reviews, under the title “Dynamic Topological Metasurfaces via Moving Exceptional Points for Terahertz Wavefront Engineering.”
Figure 1: Schematic diagram of a reconfigurable‑topology metasurface based on dynamic EP engineering.
Figure 2: Design and numerical characterization of tunable plasma-topology meta-atoms.
Figure 3: Design principle and workflow of a dynamically spin-decoupled topological metasurface.
Figure 4: Experimental demonstration of switchable near-field focusing and far-field orbital angular momentum (OAM) generation via leakage radiation.
Source: Optics World
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