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Rotationally Tunable Vortex Beam Generator
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DOI：10.1002/lpor.71326.png)
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Abstract
En 中文
Orbital angular momentum (OAM), inherently possessed by vortex beams, shows substantial promise for enabling high-capacity data multiplexing. For practical implementation in OAM modulation and multiplexing, a compact, lightweight vortex beam generator that enables dynamic tuning of OAM modes represents an essential step. However, current solutions typically offer fixed or limited tunable modes. Here, we propose and experimentally demonstrate a dynamically tunable vortex beam generation scheme based on two cascaded flat elements composed of the geometric phase nanopore structures induced by femtosecond-laser processing in silica substrate. Leveraging the Alvarez–Lohmann principle, different integer OAM modes with mode numbers reaching up to 40, are dynamically generated across a broad wavelength range from 480 to 750 nm by the mutual rotation of the two planar elements. Furthermore, by modifying the second element or using linear polarization illumination, dynamic generation of perfect vortex beams (PVBs) and cylindrical vector beams (CVBs) can also be accomplished, respectively. The femtosecond-laser-modified materials provide exceptional transmission efficiency and high damage thresholds, further enhancing the device's versatility. Therefore, this compact, tunable platform offers a promising solution for on-chip optical systems, advancing the integration and miniaturization of OAM-based technologies.
Keywords:
cylindrical vector beam
dynamic tunable
femtosecond-laser-modified materials
perfect vortex beam
planar element
vortex beam
Journal
L
IF:
10
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1.1K
Citations:
1