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Multifunctional wavefront modulation with polarization switching
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DOI：10.1016/j.optlaseng.2026.109751.png)
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Abstract
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Metasurfaces have shown remarkable abilities in modulating wavefronts, yet most current designs are limited to a single function, and integrating dynamic control with multifunctional switching still represents a key unmet challenge. Vanadium dioxide (VO2), a thermally regulated phase-change material (PCM), is commonly applied in metasurface development. This work presents a terahertz VO2 metasurface with multifunctional wavefront modulation and switchable polarization. By encoding meta-atoms with tailored wavefront configurations and utilizing VO2's phase transition to realize polarization switching and multifunctional adjustment, four distinct wavefronts are achieved with different polarizations. As a feasibility study, a 0 degrees linearly polarized (LP) wave is normally incident. As VO2 is metallic, 0 degrees LP channel of reflected wave achieves Y-shaped holography, while 90 degrees LP channel generates a vortex beam (VB). When VO2 is insulating, 45 degrees LP channel of reflected wave achieves anomalous deflection, and 135 degrees LP channel achieves focusing. The designed metasurface also exhibits excellent broadband characteristics, providing intended four-channel wavefront modulation at 0.60-0.80 THz. Owing to the integrated multifunctionality, our scheme has significant potentiality for various applications in beam manipulation.
Keywords:
Metasurface
Multifunctional
Polarization
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