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

ABSTRACT: 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 i

SUBMITTER: Li Z 

PROVIDER: S-EPMC4598830 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature