Full-polarization reconfigurable metasurface for broadband and versatile modulation of electromagnetic waves

<正>Reconfigurable metasurfaces enable dynamic and real-time manipulation of electromagnetic（EM） waves in subwavelength resolution, possessing unparalleled potentials to construct meta-devices. However, most existing reconfigurable metasurfaces either operate under single polarization or in limited polarization channels or discretely tailor EM variables within relatively narrow bandwidth, which are hard to adapt to the urgent development requirements of multitask and highly integrated intelligent communication systems. Herein, a reconfigurable metasurface strategy based on continuous amplitude modulation utilizing circularly polarized（CP） basis vectors is proposed and demonstrated, with which the orthogonal component energy proportion of an arbitrarily polarized wave can be tailored, achieving full-polarization customized broadband and versatile function generation and control. Two symmetrically positive–intrinsic–negative diodes embedded into split-ring resonators are employed to simultaneously and independently switch dual-channel co-polarized amplitude with almost unaltered phase, which significantly simplifies control framework and enhances information capacity. In addition, a fullpolarization reconfigurable metasurface prototype of 0.1λ0 thickness is designed and fabricated, which can continuously tune the reflection, polarization conversion, and absorption via loading different external bias voltages from 6 to 8.6 GHz. This inspiring methodology opens up routes for advanced multiplexed equipment and might find applications in future-oriented data storage and multi-input/multi-output systems. ? 2024 Chinese Laser Press