文章基本信息

标题：Intensity tunable infrared broadband absorbers based on VO₂ phase transition using planar layered thin films
本地全文：下载
作者：Hasan Kocer ; Serkan Butun ; Edgar Palacios 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep13384
出版社：Springer Nature
摘要：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.