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Opt Express. 2013 Apr 8;21(7):9113-22. doi: 10.1364/OE.21.009113.

Strong absorption and selective emission from engineered metals with dielectric coatings.

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Department of Electrical and Computer Engineering, Micro and Nanotechnology Lab, University of Illinois Urbana Champaign, 208 N. Wright St., Urbana, IL 61801, USA.


We demonstrate strong-to-perfect absorption across a wide range of mid-infrared wavelengths (5-12┬Ám) 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.

[Indexed for MEDLINE]

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