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Omnidirectional, broadband light absorption using large-area, ultrathin lossy metallic film coatings

Scientific reports, 2015-10, Vol.5 (1), p.15137-15137, Article 15137 [Peer Reviewed Journal]

Copyright Nature Publishing Group Oct 2015 ;Copyright © 2015, Macmillan Publishers Limited 2015 Macmillan Publishers Limited ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/srep15137 ;PMID: 26450563

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  • Title:
    Omnidirectional, broadband light absorption using large-area, ultrathin lossy metallic film coatings
  • Author: Li, Zhongyang ; Palacios, Edgar ; Butun, Serkan ; Kocer, Hasan ; Aydin, Koray
  • Subjects: Chromium ; Coatings ; Filters ; Industrial production ; Nanostructured materials ; Nanotubes ; Polarization
  • Is Part Of: Scientific reports, 2015-10, Vol.5 (1), p.15137-15137, Article 15137
  • Description: Resonant absorbers based on nanostructured materials are promising for variety of applications including optical filters, thermophotovoltaics, thermal emitters, and hot-electron collection. One of the significant challenges for such micro/nanoscale featured medium or surface, however, is costly lithographic processes for structural patterning which restricted from industrial production of complex designs. Here, we demonstrate lithography-free, broadband, polarization-independent optical absorbers based on a three-layer ultrathin film composed of subwavelength chromium (Cr) and oxide film coatings. We have measured almost perfect absorption as high as 99.5% across the entire visible regime and beyond (400-800 nm). In addition to near-ideal absorption, our absorbers exhibit omnidirectional independence for incidence angle over ±60 degrees. Broadband absorbers introduced in this study perform better than nanostructured plasmonic absorber counterparts in terms of bandwidth, polarization and angle independence. Improvements of such "blackbody" samples based on uniform thin-film coatings is attributed to extremely low quality factor of asymmetric highly-lossy Fabry-Perot cavities. Such broadband absorber designs are ultrathin compared to carbon nanotube based black materials, and does not require lithographic processes. This demonstration redirects the broadband super absorber design to extreme simplicity, higher performance and cost effective manufacturing convenience for practical industrial production.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/srep15137
    PMID: 26450563
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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