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Fraxicon for Optical Applications with Aperture ∼1 mm: Characterisation Study.

Haoran Mu1, Daniel Smith1, Soon Hock Ng1,2

  • 1Optical Sciences Centre, ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), Swinburne University of Technology, Hawthorn, VIC 3122, Australia.

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|February 9, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel micro-optical elements using femtosecond laser writing for miniaturized light sources. These "fraxicons" are promising for advanced biomedical applications requiring precise light control.

Keywords:
RGBSZ2080™ resistdirect laser writingfraxiconmicro-optics

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Area of Science:

  • Optics and Photonics
  • Biomedical Engineering
  • Materials Science

Background:

  • Miniaturized light sources require matching micro-optical elements with sub-1 mm cross-sections and high optical quality.
  • Spatially constrained biomedical applications like endoscopy and optogenetics demand reduced dimensionality in optical components.

Purpose of the Study:

  • To adapt the Fresnel lens approach for conical lenses (axicons), creating planarized axicons (fraxicons).
  • To fabricate and optically characterize positive and negative fraxicons using direct laser writing.
  • To numerically model fraxicon performance under various illumination conditions.

Main Methods:

  • Direct femtosecond laser writing (780 nm/100 fs) in SZ2080™ polymer.
  • Fabrication of positive and negative fraxicons.
  • Optical characterization and numerical modeling of fraxicon performance.

Main Results:

  • Successful fabrication of planarized axicons (fraxicons) with sub-1 mm cross-sections.
  • Optical characterization data for positive and negative fraxicons.
  • Comparison of numerical modeling results under different illumination conditions (incoherent, extended, plane-wave).

Conclusions:

  • The developed fraxicon fabrication method shows promise for demanding technological applications.
  • The approach allows for rapid replication in soft polymers and resists.
  • These micro-optical elements are suitable for miniaturized light source applications in biomedicine.