期刊
OPTICS EXPRESS
卷 21, 期 7, 页码 9113-9122出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.21.009113
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- AFOSR Young Investigator Program [FA9550-10-1-0226]
- NSF REU program [ECCS-1157933]
We demonstrate strong-to-perfect absorption across a wide range of mid-infrared wavelengths (5-12 mu m) 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. (c) 2013 Optical Society of America
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