Intensity tunable infrared broadband absorbers based on VO2 phase transition using planar layered thin films.
Sci Rep
; 5: 13384, 2015 Aug 21.
Article
em En
| MEDLINE
| ID: mdl-26294085
ABSTRACT
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 (VO2) phase transition. Using planar layered thin film structures, where top layer is chosen to be an ultrathin (20 nm) VO2 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.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
Sci Rep
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos