Tunable Orbital Angular Momentum Converter Based on Integrated Multiplexers

Photonic Integrated Circuit for Rapidly Tunable Orbital Angular Momentum Generation Using Sb2Se3 Ultra‐Low‐Loss Phase Change Material

“…This provides a theoretically infinite number of channels that can be multiplexed with existing beam states since l can take any value. [1][2][3][4][5][6][7][9][10][11] These states can be added to the existing beam states that use wavelength, amplitude, phase, time, and polarization of light to encode information. For the OV, the value of the phase's integral of the electric field around a path enclosing the vortex is equal to lħ, where l is the topological charge and ħ is Planck's constant divided by 2π.…”

“…There are several prior demonstrations that have produced different OAM states on-chip by coupling to different ports on a passive chip, [24] adjusting the operating wavelength, [7] or by introducing heaters into Si as a mechanism for tuning. [9,25] However, while such devices have shown the principle of tunability, fast tuning of OAM modes would benefit from better mechanisms for tuning than was previously explored.…”