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Development of flat-surface nanostructured phase components for the formation of fractional optical vortex beams

Nguyen H.T., Kasztelanic R., Le H.V., Thi H.T., Pysz D., Nguyen V.P., Hoang V.T., Omatsu T., Buczyński R.

Journal of Physics-Photonics

8(2), 2026, art. 025007, 10.1088/2515-7647/ae5d0d

We report the development and characterization of a fractional nanostructured gradient-index (GRIN) vortex phase component for generating fractional optical vortex (OV) beams in the near-infrared. The element was fabricated using a modified stack-and-draw method, yielding a proof-of-concept mask with a thickness of 38μm and a 30 μm vortex core. The performance of the component was evaluated through both theoretical analysis and experiment. Optical measurements confirmed the formation of OV beams with integer and fractional topological charges between l= 3 and l= 4, exhibiting characteristic phase singularities and corresponding intensity structure, in good agreement with numerical simulations. The flat-surface geometry, broadband spectral response, and reproducible fabrication approach confirm the fractional nanostructured GRIN vortex phase component as a compact and versatile platform for controllable vortex generation, with potential applications in optical tweezers, biological particle manipulation, optical communication, optical imaging, and laser-based material processing.


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