Design and deposition of a metal-like and admittance-matching metamaterial as an ultra-thin perfect absorber.

ABSTRACT: A stratiform metamaterial, comprising metal and dielectric thin films, exhibits both near-perfect antireflection and strong light extinction to function as a perfect and ultra-thin light absorber. The equivalent admittance and extinction coefficient of the metamaterial are tailored using a visual method that is based on an admittance diagram. A five-layered metamaterial was designed and deposited with a total thickness of 260?nm on a mirror to exhibit strong and wide angle absorption over wavelengths from 400?nm to 2000?nm. A seven-layered metamaterial with a total thickness of less than 200?nm was designed and deposited to have equivalent admittance around unity and an extinction coefficient that is comparable to that of metal. Such a metal-like metamaterial exhibits low reflectivity so couples most visible light energy into the films and dissipates energy with an equivalent skin depth of less than 55?nm over visible wavelengths.

SUBMITTER: Jen YJ 

PROVIDER: S-EPMC5465059 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature