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Bioinspired Microstructured Polymer Surfaces with Antireflective Properties.

Alexandre Emmanuel Wetzel1, Nuria Del Castillo Iniesta1, Einstom Engay1

  • 1National Centre for Nano Fabrication and Characterization (DTU Nanolab), Technical University of Denmark, Ørsted Plads 347, 2800 Kongens Lyngby, Denmark.

Nanomaterials (Basel, Switzerland)
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

Researchers mimicked peacock spider microstructures to create highly effective antireflective surfaces. This biomimetic approach resulted in super black coatings with ultra-low reflectance, paving the way for cost-effective mass production.

Keywords:
3D printingantireflectivebiomimeticpolymer microstructuressuper blacktwo-photon polymerization

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Area of Science:

  • Biomimetics and Materials Science
  • Optics and Nanotechnology

Background:

  • Antireflective surfaces are crucial for optical applications.
  • Nature, particularly animals like peacock spiders, offers inspiration for advanced surface structures.
  • Peacock spider super black patches feature unique microstructures with antireflective properties.

Purpose of the Study:

  • To fabricate and characterize antireflective microarrays inspired by peacock spider structures.
  • To explore biomimicry for developing efficient and replicable antireflective surfaces.
  • To achieve ultra-low reflectance using bioinspired designs.

Main Methods:

  • Generating 3D models of microarrays based on surface equations.
  • Fabricating arrays in polyacrylate resin using two-photon polymerization (a super-resolution 3D printing technique).
  • Inspecting fabricated structures with scanning electron microscopy and characterizing reflectance/transmittance.

Main Results:

  • Successfully fabricated bioinspired microlens arrays.
  • Achieved ultra-low reflectance of 0.042 ± 0.004% at 550 nm and normal incidence.
  • Demonstrated the effectiveness of tightly-packed, slightly pyramidal lens arrays.

Conclusions:

  • Peacock spider-inspired microstructures offer excellent antireflective properties.
  • Biomimetic design and advanced 3D printing enable efficient replication of natural antireflective features.
  • The developed microarrays show potential for cost-effective mass production of advanced optical surfaces.