Trifunctional metasurface for manipulating linearly and circularly polarized waves in transmission and reflection modes

Integration of multiple functionalities into a single, planar, and ultra-compact device has become an emerging research area in photonics. In this work, we design, fabricate, and experimentally demonstrate a trifunctional metasurface integrated by meta-atoms with resonant and geometrical phase cells. By changing the polarization and incident direction of electromagnetic (EM) waves, the wavefronts of the transmitted and reflected waves can be reshaped. The metasurface exhibits the strong capability to manipulate both the linearly polarized (LP) wave and circularly polarized (CP) wave at different frequencies. Therefore, the designed trifunctional metasurface can achieve three distinct functionalities including beam deflecting for X-linearly polarized (X-LP) wave at 13 GHz impinging from below, and diverging and focusing lens for CP waves at 9 GHz impinging from above. Both far-field and near-field microwave experiments demonstrate the predicted functionalities of the fabricated device, which can advance research and applications related to other distinct functionalities of photonics integration.