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Biomimetic non-uniform nanostructures reduce broadband reflectivity in transparent substrates

Published online by Cambridge University Press:  08 May 2019

Alexandra A. Sourakov Open the ORCID record for Alexandra A. Sourakov [Opens in a new window]  and
Ahmed Al-Obeidi
Alexandra A. Sourakov*
Affiliation:
Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
Ahmed Al-Obeidi
Affiliation:
Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
*
Address all correspondence to Alexandra A. Sourakov at [email protected]
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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°.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 2 , June 2019 , pp. 637 - 643
Copyright
Copyright © Materials Research Society 2019 

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