Mode Conversion between Beams Carrying Orbital Angular Momentum ...

A. Soltani, Z.H. Firouzeh, S.F. Mousavi, A. Zeidaabadi-Nezhad, and R. Nouroozi, “Mode Conversion between Beams Carrying Orbital Angular Momentum with Opposite Topological Charges using Two-Dimensional Multimode Interference Waveguides”, Journal of Lightwave Technology, vol. 41, no. 7, pp. 2179-2184, doi:10.1109/JLT.2022.3225820,  April 2023.