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Abstract Dynamic wavefront modulation enables the performance enhancement of optical devices. Few reseachers have achieved the dynamic wavefront modulation of orbital angular momentum (OAM). In this work, a dynamic modulation of six-channel OAMs is realized. When VO 2 is metallic, the metasurface realizes OAM with a mode of l = − 3 in the left-handed circularly polarized (LCP) copolarized reflection channel. In the right-handed circularly polarized (RCP) copolarized reflection channel, a vortex beam is generated with a mode of l = − 1. In CP cross-polarized reflection channels, OAMs are generated with a mode of l = − 2. Relatively, as VO 2 is insulating, OAM is presented with a mode of l = 1 in the LCP copolarized reflection channel. In the RCP copolarized reflection channel, a vortex beam is achieved with a topological charge of l = 3. In CP cross-polarized reflection channels, the obtained OAMs have a mode of l = 2. As a result, our design has flexible multichannel characteristics. Furthermore, it shows considerable application value in beam shaping and optical encryption.
Guo et al. (Thu,) studied this question.
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