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Open AccessArticle

Broadband Anti-Reflective Coating Based on Plasmonic Nanocomposite

Nanochemistry and Nanoengineering, Institute for Materials Science, Faculty of Engineering, Christian-Albrechts-Universität zu Kiel, Kiel 24143, Germany
Institute of Condensed Matter Theory and Optics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, Jena 07743, Germany
Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, Karlsruhe 76131, Germany
Institute of Nanotechnology, Karlsruhe Institute of Technology, P.O. Box 3640, Karlsruhe 76021, Germany
Nanochemistry and Nanoengineering, Helmholtz-Zentrum Geesthacht, Geesthacht 21500, Germany
Nanochemistry and Nanoengineering, School of Chemical Technology, Aalto University, Kemistintie 1, Aalto 00076, Finland
Authors to whom correspondence should be addressed.
Academic Editor: Klara Hernadi
Materials 2016, 9(8), 636;
Received: 12 June 2016 / Revised: 5 July 2016 / Accepted: 25 July 2016 / Published: 28 July 2016
(This article belongs to the Section Energy Materials)
We report on the fabrication, the characterization, and the optical simulation of a gold–silica nanocomposite and present its integration into a broadband anti-reflective coating (ARC) for a silicon substrate. The two-layer ARC consists of a nanocomposite (randomly distributed gold cluster in a silica matrix) and a pure silica film. We capitalize on the large refractive index of the composite to impose an abrupt phase change at the interface of the coating to diminish the light reflection from the substrate through the ultrathin nanocoating. The average reflectivity of the silicon can be reduced by such a coating to less than 0.1% in the entire visible spectrum. We experimentally and numerically prove that percolated nanocomposites with an overall thickness of 20 nm can provide anti-reflectivity up to near infrared (NIR). The ARC bandwidth can be shifted more than 500 nm and broadened to cover even the NIR wavelength by changing the volume filling fraction of the gold clusters. The angular sensitivity of thin ultrathin antireflective coating is negligible up to 60°. The present ARC could find applications in thermo-photovoltaics and bolometers. View Full-Text
Keywords: antireflective coating; plasmonic nanocomposite; absorbing antireflective coating; antireflection antireflective coating; plasmonic nanocomposite; absorbing antireflective coating; antireflection
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Keshavarz Hedayati, M.; Abdelaziz, M.; Etrich, C.; Homaeigohar, S.; Rockstuhl, C.; Elbahri, M. Broadband Anti-Reflective Coating Based on Plasmonic Nanocomposite. Materials 2016, 9, 636.

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