Dual Non-Diffractive Beam Generation via Spin-and-Frequency-Multiplexed All-Dielectric Metasurfaces at Terahertz Frequencies

Metasurfaces, two-dimensional metamaterials comprising subwavelength units, have the unique ability to control the phase, amplitude, and polarization of incident electromagnetic waves [1]. Metasurfaces engineered with dielectric materials, such as silicon, demonstrate high transmission efficiency, making them ideally suited for generating non-diffractive beams in the spectrally-important terahertz frequency range.