Plasmonic black metals via radiation absorption by two-dimensional arrays of ultra-sharp convex grooves.

ABSTRACT: Plasmonic black surfaces formed by two-dimensional arrays of ultra-sharp convex metal grooves, in which the incident radiation is converted into gap surface plasmon polaritons (GSPPs) and subsequently absorbed (via adiabatic nanofocusing), are fabricated and investigated experimentally for gold, nickel, and palladium, using scanning electron microscopy, optical microscopy, and reflection spectroscopy for their characterization. Absolute reflectivity spectra obtained for all fabricated arrays demonstrate very efficient and broadband absorption of unpolarized light exceeding the level of 95%, averaged over the investigated wavelength range of 400-985 nm. The highest averaged absorption level (~97%) is achieved with 250-nm-period arrays in palladium that also has the highest melting temperatu

SUBMITTER: Beermann J 

PROVIDER: S-EPMC4219155 | biostudies-literature | 2014 Nov

REPOSITORIES: biostudies-literature