Noninterleaved Completely Helicity-Modulated Cascaded Metasurface Empowering Full-Space Energy-Controllable Arbitrary Wavefront Manipulation

Abstract

Multidimensional regulation of electromagnetic (EM) waves, especially for that joint amplitude-phase modulation occurring at different polarization channels, is pivotal for new-generation information processing and wireless communication. Helicity-multiplexed cascaded metadevices with low crosstalk and high efficiency are applied to complicated EM manipulation, but most are confined to half-space locked helicity states and modes. Herein, via introducing propagation phase with constructive interference into geometric phase, full-space helicity-dependent decoupling relationship between amplitude and phase engineering based on single-pixeled meta-particle is derived, and the implementing mechanism of nonsinterleaved completely helicity-modulated cascaded metasurface (NCHCM) in full space is further elucidated. Meanwhile, point-source diffraction method and iterative optimization algorithm are, respectively, developed to design the NCHCM, enabling precise holographic imaging performances. On this basis, two functional meta-devices assisted by energy-controllable NCHCM, including dual-channel helicity-selective complex-amplitude (CA) meta-hologram and quadruple-polarization-channel equal-amplitude phase-only meta-hologram, are demonstrated in the microwave region. The full-space completely helicity-modulated paradigm will boost the research of multidimension-controlled metasurfaces and might find multichannel delivery and information multiplexing applications in miniaturized and highly integrated systems.