Open AccessStrong absorption and selective emission from engineered metals with dielectric coatings
Author(s) -
W. Streyer,
Stephanie Law,
G. Rooney,
Thomas Jacobs,
D. Wasserman
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.009113
Subject(s) - materials science , dielectric , optics , absorption (acoustics) , germanium , polarization (electrochemistry) , silicon , refractive index , resonance (particle physics) , optoelectronics , wavelength , infrared , atomic physics , chemistry , physics , composite material
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.