title: Strong absorption and selective emission from engineered metals with dielectric coatings.
abstract: We demonstrate strong-to-perfect absorption across a wide range of mid-infrared wavelengths (5-12µm) using a two-layer system consisting of heavily-doped silicon and a thin high-index germanium dielectric layer. We demonstrate spectral control of the absorption resonance by varying the thickness of the dielectric layer. The absorption resonance is shown to be largely polarization-independent and angle-invariant. Upon heating, we observe selective thermal emission from our materials. Experimental data is compared to an analytical model of our structures with strong agreement.
authors.affiliation: Department of Electrical and Computer Engineering, Micro and Nanotechnology Lab, University of Illinois Urbana Champaign, 208 N. Wright St., Urbana, IL 61801, USA.
authors.forename: W
authors.initials: W
authors.lastname: Streyer
authors.forename: S
authors.initials: S
authors.lastname: Law
authors.forename: G
authors.initials: G
authors.lastname: Rooney
authors.forename: T
authors.initials: T
authors.lastname: Jacobs
authors.forename: D
authors.initials: D
authors.lastname: Wasserman
mesh_terms: D000042:Absorption; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005857:Germanium / Q000737:chemistry*; D007259:Infrared Rays; D008027:Light; D008422:Materials Testing; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D005857:Germanium