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Closely packed hexagonal conical microlens array fabricated by direct laser photopolymerization.

Albertas Žukauskas1, Mangirdas Malinauskas, Carsten Reinhardt

  • 1Department of Quantum Electronics, Vilnius University, Vilnius, Lithuania. albertas.zukauskas@ff.stud.vu.lt

Applied Optics
|August 4, 2012
PubMed
Summary

Femtosecond laser direct writing fabricates high-quality conical microlenses (axicons). Optimized parameters and modeling confirm performance for microscopy and microfluidic applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microfabrication

Background:

  • Micro-optics are crucial for miniaturized optical systems.
  • Axicons generate Bessel beams, useful for non-diffracting light propagation.
  • Femtosecond laser direct writing offers high precision for micro-optics fabrication.

Purpose of the Study:

  • To fabricate high optical quality conical microlenses (axicons) using femtosecond laser direct writing.
  • To model and experimentally validate the optical performance of fabricated axicons.
  • To optimize fabrication parameters for axicon microlenses and their arrays.

Main Methods:

  • Femtosecond laser direct writing in photopolymers.
  • Finite-difference time-domain (FDTD) method for optical modeling.

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  • Experimental characterization of fabricated axicon microlenses.

    • Main Results:

    • Successfully fabricated axicons with 15 µm radius and cone angles of 150°, 160°, and 170°.
    • High optical quality demonstrated through modeling and experimental comparison.
    • Optimization of laser direct writing parameters for micro-object fabrication.

    Conclusions:

    • Femtosecond laser direct writing is a viable technique for producing high-quality axicon microlenses.
    • Fabricated axicons show promising performance for various advanced applications.
    • Potential applications include microscopy, material processing, and microfluidics.