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Related Experiment Video

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Broadband optical vortex beam generation using flat-surface nanostructured gradient index vortex phase masks.

Hue Thi Nguyen1,2,3, Rafal Kasztelanic4,5, Adam Filipkowski4,5

  • 1University of Warsaw, Faculty of Physics, 02-093, Warsaw, Poland. hue.nguyen@fuw.edu.pl.

Scientific Reports
|November 21, 2023
PubMed
Summary
This summary is machine-generated.

We created a compact, nanostructured gradient index vortex phase mask for generating optical vortex beams (OVB) in the infrared. This low-cost device offers broadband performance and can be integrated with optical fibers.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Optical vortex beams (OVB) have diverse applications but require efficient generation methods.
  • Existing OVB generators can be bulky or limited in wavelength range.
  • Nanostructured optical components offer miniaturization and novel functionalities.

Purpose of the Study:

  • To develop a compact, broadband infrared optical vortex phase mask.
  • To utilize low-cost nanotechnological fabrication methods.
  • To demonstrate effective generation and characterization of optical vortex beams.

Main Methods:

  • Fabrication of a nanostructured gradient index vortex phase mask using lead-bismuth-gallium silicate glass rods.
  • Application of effective medium theory for refractive index design.
  • Numerical simulations and experimental verification using diode lasers across the 1275-1565 nm range.

Main Results:

  • A 19 μm thick nanostructured mask successfully converted Gaussian beams to fundamental optical vortices.
  • Broadband operation achieved over a 290 nm bandwidth (1275-1565 nm).
  • Experimental results confirmed OVB generation via intensity profiles, astigmatic transformations, and interferograms.

Conclusions:

  • A novel, compact, flat-surface nanostructured gradient index vortex phase mask was successfully developed.
  • The device enables efficient, broadband generation of optical vortex beams in the infrared.
  • Potential for direct integration with optical fiber tips simplifies OVB generation systems and manipulation.