Polarization-controlled multifunctional coding metasurface operating in transmission-reflection modes

Abstract

In this paper, a polarization-controlled multifunctional coding metasurface is presented by integrating reflection and transmission coding metasurfaces, where a filter layer is inserted between them to ensure good performances of reflection and transmission modes. A cross-type pattern as reflection element and two double-G patterns as transmission elements are respectively encoded based on propagation phase and geometrical phase principles for independently manipulating the reflected and transmitted waves. By configuring the organized phase profile on the presented coding metasurface, the functions of beam splitting, radar cross section (RCS) reduction and vortex beam generator can be achieved at different frequencies by changing the polarization state of incident waves. Such design can perform three separate functions and simultaneous controls of transmitted and reflected wavefronts on a metasurface. Both numerical and theoretical calculated results verify the outstanding properties of the presented multifunctional coding metasurface. This scheme provides an efficient method to realize multi-function metadevices, which may have potential applications in highly integrated electromagnetic (EM) systems.