Broadband anti-reflective coating based on plasmonic nanocomposite

Mehdi Keshavarz Hedayati*, Moheb Abdelaziz, Christoph Etrich, Shahin Homaeigohar, Carsten Rockstuhl, Mady Elbahri

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)
    229 Downloads (Pure)

    Abstract

    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.

    Original languageEnglish
    Article number636
    JournalMaterials
    Volume9
    Issue number8
    DOIs
    Publication statusPublished - 28 Jul 2016
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Absorbing antireflective coating
    • Antireflection
    • Antireflective coating
    • Plasmonic nanocomposite

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