Intensity tunable infrared broadband absorbers based on VO2 phase transition using planar layered thin films

Plasmonic and metamaterial based nano/micro-structured materials enable spectrally selective resonant absorption, where the resonant bandwidth and absorption intensity can be engineered by controlling the size and geometry of nanostructures. Here, we demonstrate a simple, lithography-free approach f...

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Bibliographic Details
Published in:Scientific reports 2015-08, Vol.5 (1), p.13384, Article 13384
Main Authors: Kocer, Hasan, Butun, Serkan, Palacios, Edgar, Liu, Zizhuo, Tongay, Sefaattin, Fu, Deyi, Wang, Kevin, Wu, Junqiao, Aydin, Koray
Format: Article
Language:English
Subjects:
639/624/399/1015
639/624/399/1098
Absorption
Filters
Humanities and Social Sciences
multidisciplinary
Phase transitions
Science
Thin films
Vanadium
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Summary:Plasmonic and metamaterial based nano/micro-structured materials enable spectrally selective resonant absorption, where the resonant bandwidth and absorption intensity can be engineered by controlling the size and geometry of nanostructures. Here, we demonstrate a simple, lithography-free approach for obtaining a resonant and dynamically tunable broadband absorber based on vanadium dioxide (VO 2 ) phase transition. Using planar layered thin film structures, where top layer is chosen to be an ultrathin (20 nm) VO 2 film, we demonstrate broadband IR light absorption tuning (from ~90% to ~30% in measured absorption) over the entire mid-wavelength infrared spectrum. Our numerical and experimental results indicate that the bandwidth of the absorption bands can be controlled by changing the dielectric spacer layer thickness. Broadband tunable absorbers can find applications in absorption filters, thermal emitters, thermophotovoltaics and sensing.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep13384