Programmble Metasurface for Efficient Generation of Convergent Multi-Mode OAM Beams

A reconfigurable 1-bit digital coding metasurface is introduced for efficiently stimulating convergent multi-mode dynamic vortex beams. The introduced metasurface consists of reconfigurable cells with 1-bit phase quantization by integrating the PIN diode to modulate the reflective phase property of the cell. Through programming the phase distribution of the metasurface., the dynamic vortex beams are thus stimulated.