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Continuously tuneable single electrode pair liquid crystal optical vortex generators.

Camron Nourshargh1, Alec Xu1, Patrick S Salter1

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Summary
This summary is machine-generated.

Researchers created tuneable optical vortex (OV) generators using laser writing in liquid crystals. The OV beam

Keywords:
direct laser writingliquid crystal devicesmulti-orderoptical vortex beamstwo-photon polymerization

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Liquid Crystal Displays

Background:

  • Optical vortex beams (OVs) have unique properties valuable for advanced applications.
  • Controlling OV properties like order and chirality is crucial for their use.
  • Existing methods for generating tuneable OVs can be complex or limited.

Purpose of the Study:

  • To demonstrate a novel method for fabricating continuously tuneable optical vortex (OV) generators.
  • To investigate the tunability of OV order in liquid crystal (LC) devices using voltage.
  • To explore the potential of 3D polymer structuring for creating phase profiles in LC devices.

Main Methods:

  • Utilizing two-photon polymerization direct laser writing to create 3D polymer structures within a liquid crystal layer.
  • Fabricating a liquid crystal device with a single pair of electrodes for voltage application.
  • Employing a Mach-Zehnder interferometer and polarizing optical microscopy for device characterization.

Main Results:

  • Successfully inscribed OV generators into a 20 μm-thick liquid crystal layer.
  • Demonstrated continuous tuning of the OV beam order by applying voltage.
  • Confirmed the generation of OVs with different orders and determined their chirality.
  • The 3D polymer network generated the required phase profile for voltage-controlled tuning.

Conclusions:

  • The developed liquid crystal-optical vortex generators offer a novel and efficient method for producing tuneable OVs.
  • The use of direct laser writing allows for precise 3D structuring, enabling voltage-controlled tunability with a single electrode pair.
  • These devices show promise for applications in optical communications, quantum physics, and other fields requiring controlled light manipulation.