Spin Decoupling–Tensor Holographic Impedance Hybrid Metasurface for Full-Space Circular Airy Beams

In this letter, a spin decoupling phase gradient (SDPG)–tensor holographic impedance (THI) single-layer full-space hybrid metasurface (MTS) is developed, and the integrated THI and SDPG MTSs can be controlled independently. For example, full-space four circular Airy beams with high orbital angular momentum (OAM) mode purity (above 85%) are designed: (LHCP, l₁ = 1, θ₁ = 150°, ϕ₁ = 0°, 36 GHz), (RHCP, l₂ = −1, θ₂ = 150°, ϕ₂ = 180°, 36 GHz), (LP, l₃ = 1, θ₃ = 30°, ϕ₃ = 0°, 12 GHz), (RHCP, l₄ = −1, θ₄ = 30°, ϕ₄ = 180°, 12 GHz). The unique contributions of the letter are as follows: To the knowledge of the authors, for the first time, space wave modulation–surface wave modulation integrated full-space hybrid MTS is developed. THI-SDPG integrated MTS combines the advantages of SDPG (controlling any pair of orthogonal polarizations) and THI (realizing arbitrary polarizations), and greatly expands the freedom of multifunctional design. The following advantages are achieved simultaneously: full space, single layer, arbitrary polarization, and switchability. The developed MTS has promising applications in bidirectional nearfield high-capacity communication.