Strong absorption and selective emission from engineered metals with dielectric coatings.
Open Access
- 4 April 2013
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 21 (7), 9113-9122
- https://doi.org/10.1364/oe.21.009113
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.Keywords
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