Generic Vectorial Hologram Based on Simultaneous and Independent Amplitude and Phase Modulation of Orthogonal Polarization States via Single Completely Spin-Decoupled Meta-Particles

Metasurfaces composed of subwavelength structure arrays provide a diverse and powerful platform for generation of complicated electromagnetic (EM) fields and wavefronts manipulation and have triggered an unprecedented research upsurge in electromagnetism with the development of computer-generated holography (CGH). Different from conventional scalar holograms only containing amplitude and phase properties, a vectorial hologram that benefits from the maneuverability of polarization of EM fields exhibits more immeasurable application potential and is simultaneously regarded as an urgent requirement. In this work, assisted by single completely spin-decoupled meta-particles, which perfectly combine the functions of simultaneous and independent amplitude and phase modulation of orthogonal polarization states containing left- and right-handed circularly polarized (LCP&RCP) components, a vectorial hologram induced through eigenstates degeneracy with the ability of encoding arbitrary polarization is proposed in the microwave region. As the proof of concept, eight distinct holograms with specified polarizations and six-channel polarization-multiplexed hologram display are fabricated and characterized, further showcaing the versatility of the approach for the customization of arbitraty polarization and integration of reconstructed patterns. With the advantages of multi-controllability and ultra-compactness, the constructed monolayer completely spin-decoupled paradigm for vectorial regulation may find prospective application aspects in spin detection, target perception, multi-channel data encryption, and many other related fields.

Automated summary

Metasurfaces composed of subwavelength structure arrays provide a powerful platform for generating complicated electromagnetic fields and manipulating wavefronts. This study proposes a vectorial hologram based on meta-particles, which allows encoding of arbitrary polarization and integration of reconstructed patterns. Multiple holograms were fabricated and characterized, demonstrating the versatility of this approach.