2025/09/01 by Ali Mardan Dezfouli, Dezfouli, Ali Mardan, Mario Rakić +3
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Fluid Dynamics and Vibration Analysis #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Orbital Angular Momentum in Optics
paper · pdf · doi:10.48550/arxiv.2509.01334
openalex publication_date 2025/09/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this work, we investigate the diffraction of optical vortex beams through a tunable elliptical Fresnel phase mask (TEFPM). The resulting diffraction patterns are influenced by both the topological charge of the beam and the ellipticity of the mask, exhibiting characteristic intensity distributions that allow direct determination of the magnitude and sign of the topological charge. Requiring only a single controllable parameter, the TEFPM offers a simple and adaptable approach for vortex charge characterization, with a reduced detection distance that supports optical system compactness. The experimental results are confirmed by the exact analytical solutions.