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.
Original language | English (US) |
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Pages (from-to) | 9113-9122 |
Number of pages | 10 |
Journal | Optics Express |
Volume | 21 |
Issue number | 7 |
DOIs | |
State | Published - Apr 8 2013 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics