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Optical polymers with tunable refractive index for nanoimprint technologies.

J Landwehr1, R Fader, M Rumler

  • 1Fraunhofer Institute for Integrated Systems and Device Technology (IISB), Erlangen, 91058, Germany.

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|November 27, 2014
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Summary

Researchers developed UV-curable polymer composites with tunable refractive index using titanium dioxide nanoparticles. These nanocomposites are suitable for fabricating micro-optical elements via nanoimprint lithography.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • High-throughput production of micro-optical elements requires advanced materials.
  • UV-curable polymer composites offer potential for microfabrication.

Purpose of the Study:

  • To prepare and characterize UV-curable polymer composites with titanium dioxide nanoparticles for micro-optical elements.
  • To tune the refractive index and assess thermal stability of the nanocomposites.

Main Methods:

  • Synthesis of titanium dioxide nanoparticles (<10 nm) using a nonaqueous sol method.
  • In situ steric stabilization of nanoparticles with organic surfactants.
  • Characterization of optical properties and thermal stability of polymer composites.

Main Results:

  • Composites exhibit high transparency and tunable refractive index (e.g., 1.626 with 23 wt% TiO2).
  • Optical properties remain stable across visible and near-IR wavelengths with surfactant adaptation.
  • Nanocomposites show low shrinkage (4%) up to 220 °C, suitable for micro-optical applications.

Conclusions:

  • UV-curable polymer composites with titanium dioxide nanoparticles enable versatile micro-optical element fabrication.
  • Nanoimprint lithography is effective for producing low-cost micro-optical elements from these nanocomposites.
  • The materials demonstrate excellent thermal stability for industrial integration.