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Dynamically Tunable Anapole Metasurface Based on  Silicon and Vanadium Dioxide



Author(s)

Cai Ju

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DOI:10.17265/2161-6213/2026.1-3.005

Department of Physics, China Jiliang University, ZheJiang, Hangzhou 310018, China

Metasurfaces have garnered extensive research attention owing to their exceptional capability for flexible manipulation of  electromagnetic waves. Anapole modes and bound states in the continuum have become research hotspots in this field, due to their  intrinsic non-radiating properties, ultra-high quality factor, and strong field enhancement effects. In this work, we propose a paired  half-disk array hybrid metasurface based on silicon and vanadium dioxide, and systematically investigate the underlying physical  mechanism of anapole resonance excitation via multipolar decomposition and electromagnetic field distribution analysis. Dynamic  tuning of the anapole mode is successfully achieved by virtue of the insulator-metal phase transition of vanadium dioxide. By breaking  the structural symmetry of the paired half-disks, we further realize the coexistence of anapole resonance and two symmetry-protected  bound states in the continuum resonances, which is validated by band structure calculations. This work provides a novel design strategy  for dynamically tunable ultra-high nanophotonic devices. 

Vanadium dioxide, toroidal dipole, dielectric nanostructures, bound states in the continuum, anapole.