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Biomimetic non-uniform nanostructures reduce broadband reflectivity in transparent substrates

  • Alexandra A. Sourakov (a1) and Ahmed Al-Obeidi (a1)

Abstract

The remarkable broadband and omnidirectional anti-reflectivity observed in the glasswing butterfly arises from the random array of nanopillars present on their wings. In the present study, analogous structures have been replicated on transparent substrates using a scalable, low-cost method that exploits surface dewetting of silver thin films on silica substrates to form an etch mask. Directional etching was applied with high selectivity between Ag and SiO2 using CHF3, allowing large aspect ratios to be achieved with 20 min etches. Single-sided nanostructuring of glass by this method improved the transmission of light by 2–8% for viewing angles of 25°, 45°, and 65°.

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Corresponding author

Address all correspondence to Alexandra A. Sourakov at sourakov@mit.edu

References

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MRS Communications
  • ISSN: 2159-6859
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