Multichannel wavefront manipulation via wavelength-polarization multiplexed terahertz metadevice

<h2>Summary</h2> As the two-dimensional counterpart of metamaterials, metasurfaces have demonstrated exceptional potential in optics due to their remarkable ability to flexibly manipulate electromagnetic waves, offering a platform for multidimensional wavefront manipulation. However, existing multiplexing techniques predominantly focus on a single physical dimension, and multi-parameter joint multiplexing still faces challenges such as limited design degrees of freedom and channel crosstalk. This paper proposes a wavelength-polarization multiplexed terahertz metadevice based on anisotropic meta-atoms, which enables independent wavefront manipulation of three-band responses under orthogonal linear polarizations within a single-layer structure, thereby creating six fully decoupled transmission channels. We designed and numerically validated a dual-polarization triple-frequency decoupled metalens, a dual-polarization achromatic vortex beam generator, and a six-channel holographic display device. This research provides a compact and efficient solution for multidimensional optical field manipulation, with promising applications in terahertz communications, high-capacity information encryption, and holographic displays.