Densely packed aluminum-silver nanohelices as an ultra-thin perfect light absorber.

ABSTRACT: Metals have been formed into nanostructures to absorb light with high efficiency through surface plasmon resonances. An ultra-thin plasmonic structure that exhibits strong absorption over wide ranges of wavelengths and angles of incidence is sought. In this work, a nearly perfect plasmonic nanostructure is fabricated using glancing angle deposition. The difference between the morphologies of obliquely deposited aluminum and silver nanohelices is exploited to form a novel three-dimensional structure, which is an aluminum-silver nanohelix array on a pattern-free substrate. With a thickness of only 470?nm, densely distributed nanohelices support rod-to-rod localized surface plasmons for broadband and polarization-independent light extinction. The extinctance remains high over wavelengths from 400?nm to 2000?nm and angles of incidence from 0° to 70°.

SUBMITTER: Jen YJ 

PROVIDER: S-EPMC5206654 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature