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Polarisation Control in Arrays of Microlenses and Gratings: Performance in Visible-IR Spectral Ranges.

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Micromachines
|July 8, 2023
PubMed
Summary

Femtosecond direct laser writing fabricated advanced microlens arrays (MLAs) and graphene oxide polarizers for compact optical systems. These micro-optical elements demonstrate high performance in the infrared spectrum.

Keywords:
3D printinggraphene oxide polariserlaser polymerisationmicrolens array

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Microlens arrays (MLAs) are crucial micro-optical elements for compact integrated systems.
  • Developing MLAs with high fidelity and specific optical properties is essential for advanced applications.
  • Integrating diffractive and refractive capabilities enhances miniaturized optical setups.

Purpose of the Study:

  • To fabricate high-fidelity microlens arrays (MLAs) and graphene oxide (GO) gratings using femtosecond direct laser write (fs-DLW).
  • To characterize the optical performance of MLAs and GO polarizers in the visible-infrared spectral window.
  • To combine MLAs and GO polarizers for dispersion control in miniaturized optical systems.

Main Methods:

  • Fabrication of MLAs in SZ2080 photoresist using fs-DLW on CaF2 substrates.
  • Fabrication of a graphene oxide (GO) grating linear polarizer by fs-DLW ablation of a GO thin film.
  • Characterization of MLAs and GO polarizers across the visible-IR spectrum.
  • Numerical modeling to simulate and validate optical performance.

Main Results:

  • Achieved MLAs with ~50% transmittance in the 2-5 μm spectral region.
  • Fabricated ultra-thin GO polarizers compatible with MLA integration.
  • Demonstrated good agreement between experimental MLA focusing and simulation results.
  • MLAs with a numerical aperture of 0.3 were fabricated, with lens height comparable to IR wavelengths.

Conclusions:

  • fs-DLW is a viable technique for fabricating high-performance MLAs and GO polarizers.
  • Integrated MLA-GO polarizer systems offer potential for advanced dispersion control.
  • The developed micro-optical elements are suitable for compact integrated optical systems operating in the IR spectrum.