Active Transmission-type Polarization-modulated Metasurface by Tailoring Electromagnetic Wave Propagation Modes
Abstract
Active reconfigurable metasurfaces provide unprecedented dynamic and real-time control of electromagnetic (EM) waves, which have attracted a great deal of attention. Despite significant progress, achieving dynamic polarization modulation with high transmission efficiency is still a challenging task. Here, we propose a paradigm that possesses the possibility of dynamically switching transmission modes between the waveguide and the spoof surface plasmon polariton (SSPP) for tailoring transmission waves. Combined with the dispersion engineering by changing the states of the voltage-driven positive-intrinsicnegative (PIN) diode, the phase difference of x- and y-components can be flexibly manipulated for achieving different polarization states in a wide frequency range. As a proof-of-concept, one of the unique states for obtaining circular polarization conversion with the Pancharatnam-Berry (PB) phase principle is selected for achieving a spin-orbital angular momentum dynamic converter. The experimental results agree well with the simulations, which verify the feasibility of the proposed strategy. Significantly, our work not only provides an alternative way to dynamically modulate the transmission polarization state but also has promising applications in holographic imaging, intelligent beam forming, and adaptive stealth.