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Tunable liquid crystal q-plates with arbitrary topological charge.

Sergei Slussarenko1, Anatoli Murauski, Tao Du

  • 1Dipartimento di Scienze Fisiche, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Napoli, Italy. sergei.slussarenko@na.infn.it

Optics Express
|March 4, 2011
PubMed
Summary

Researchers created tunable liquid crystal q-plates using photoalignment. These devices generate optical vortex beams with specific orbital angular momentum (OAM) for advanced optics applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Liquid crystal q-plates are essential for generating optical vortex beams.
  • Controlling the topological charge of q-plates is crucial for tailoring orbital angular momentum (OAM).

Purpose of the Study:

  • To fabricate electrically tunable liquid crystal q-plates with varying topological charges.
  • To demonstrate the generation of optical vortex beams with controlled OAM using these q-plates.

Main Methods:

  • Utilized a photoalignment technique with a sulphonic azo-dye as a surfactant aligning material.
  • Fabricated q-plates with topological charges of 0.5, 1.5, and 3.
  • Performed optical vortex beam generation and OAM tomography for performance evaluation.

Main Results:

  • Successfully fabricated electrically tunable liquid crystal q-plates.
  • Generated optical vortex beams with orbital angular momentum (OAM) of 1, 3, and 6 ¯h per photon.
  • Demonstrated excellent performance through OAM tomography tests.

Conclusions:

  • The developed liquid crystal q-plates offer precise control over OAM.
  • These tunable q-plates show significant potential for applications in general and quantum optics.