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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Patterned polarizers are crucial components in various optical and electronic devices.
  • Controlling liquid crystal (LC) alignment at the nanoscale is key to fabricating high-performance polarizers.

Purpose of the Study:

  • To demonstrate the fabrication of patterned polarizers using two-photon polymerization direct laser write (2PP-DLW) for LC alignment.
  • To evaluate the performance of patterned polarizers fabricated using both negative-tone (SU-8) and positive-tone (S1805) photoresists.

Main Methods:

  • Utilized 2PP-DLW to create nanostructured LC alignment surfaces with high-resolution grooves.
  • Doped liquid crystals with a black dichroic dye and combined with linear polarizers.
  • Assessed alignment quality and polarizer performance using transmission measurements and contrast ratio analysis.

Main Results:

  • Achieved patterned polarizers with varying contrast ratios (CR) and alignment uniformity.
  • S1805 photoresist yielded a higher CR of 37 and uniformity of 63% compared to SU-8 (CR 14, uniformity 65%).
  • Demonstrated 2PP-DLW's capability for submicron patterning and arbitrary polarizer designs.

Conclusions:

  • 2PP-DLW is a versatile technique for fabricating arbitrarily patterned polarizers and other LC devices.
  • Positive-tone photoresists like S1805 show promise for high-performance dichroic dye-doped LC alignment.
  • The study highlights the potential of nanoscale patterning for advanced optical component fabrication.