Full-Polarimetric Synthesized Holographic Displaying Empowered by Chirality-Assisted Metasurface

Abstract

Metasurface-based holography provides tremendous advances in multi-dimensional detection, super-resolution imaging, and cryptography applications. Current mainstream researches on holographic metasurface are primarily focused on exploring degrees of freedom to enhance information multiplexing capability. Nevertheless, from the information security point of view, it is necessary to integrate existing available freedom resources, such as multi-polarization components, to enhance the security of holographic encryption. Herein, a full-polarimetric synthetization scheme is proposed for holographic displaying to develop a novel approach for information and imaging encryption. By exploiting chirality-assisted metasurface as the implementation platform, quadruplex circular polarization components are independently phase-modulated with separate holographic sub-imaging. For an intuitive demonstration, linear polarization is set as the encoded state to acquire the synthesized intensity image with “HIT” characters. Hence, the output holographic information in transmission field can be successfully distinguished with the valid polarization. Additionally, the sensitivity and robustness property of the synthesized holographic performance is experimentally evaluated against ergodic elliptical polarization states, where the optimal performance of working efficiency and signal-to-noise ratio only appear under the preset linear polarizations. These results effectively prove the feasibility of the polarization integration hologram, opening the door to novel solutions for future full-polarimetric encryption strategies.