Reconfigurable vortex beam generator based on the Fourier transformation principle
Aiping Liu, Chang-Ling Zou, Xifeng Ren, Wen He, Mengze Wu, Guangcan, Guo, and Qin Wang

TL;DR
This paper proposes a novel on-chip method to generate and control optical vortex beams with arbitrary orbital angular momentum superpositions using Fourier holographic gratings, enabling dynamic beam manipulation for integrated photonics applications.
Contribution
It introduces a reconfigurable vortex beam generator based on Fourier transformation principles with on-demand OAM control on a photonic chip.
Findings
OAM can be controlled from -2 to 2 by phase adjustment.
Fidelity of generated vortex beams exceeds 0.69.
Working bandwidth of 80 nm with fidelity above 0.6.
Abstract
A method to generate the optical vortex beam with arbitrary superposition of different orders of orbital angular momentum (OAM) on a photonic chip is proposed. The distributed Fourier holographic gratings are proposed to convert the propagating wave in waveguides to a vortex beam in the free space, and the components of different OAMs can be controlled by the amplitude and phases of on-chip incident light based on the principle of Fourier transformation. As an example, we studied a typical device composed of nine Fourier holographic gratings on fan-shaped waveguides. By scalar diffraction calculation, the OAM of the optical beam from the reconfigurable vortex beam generator can be controlled on-demand from -2nd to 2nd by adjusting the phase of input light fields, which is demonstrated numerically with the fidelity of generated optical vortex beam above 0.69. The working bandwidth of the…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
