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Bioinspired broadband antireflection coatings on GaSb

Appl. Phys. Lett. 92, 141109 (2008); doi:10.1063/1.2908221

Published 9 April 2008

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Wei-Lun Min,1 Amaury P. Betancourt,1 Peng Jiang,1 and Bin Jiang2
1Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA
2Department of Mathematics and Statistics, Portland State University, Portland, Oregon 97201, USA
We report an inexpensive yet scalable templating technique for fabricating moth-eye antireflection gratings on gallium antimonide substrates. Non-close-packed colloidal monolayers are utilized as etching masks to pattern subwavelength-structured nipple arrays on GaSb. The resulting gratings exhibit superior broadband antireflection properties and thermal stability than conventional multilayer dielectric coatings. The specular reflection of the templated nipple arrays match with the theoretical predictions using a rigorous coupled-wave analysis model. The effect of the nipple shape and size on the antireflection properties has also been investigated by the same model. These biomimetic coatings are of great technological importance in developing efficient thermophotovoltaic cells. ©2008 American Institute of Physics
History: Received 20 February 2008; accepted 23 March 2008; published 9 April 2008
Permalink: http://link.aip.org/link/?APPLAB/92/141109/1
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0003-6951 (print)   1077-3118 (online)
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