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Strong absorption and selective emission from engineered metals with dielectric coatings
1Department of Electrical and Computer Engineering, Micro and Nanotechnology Lab, University of Illinois Urbana Champaign, 208 N. Wright St., Urbana, IL 61801, USA.
Optics Express
|April 11, 2013
Summary
This study shows a two-layer system achieves strong mid-infrared absorption (5-12µm) tunable via dielectric layer thickness. The material also exhibits selective thermal emission when heated.
Area of Science:
- Optics and Photonics
- Materials Science
- Infrared Technology
Background:
- Metamaterials enable novel light-matter interactions.
- Efficient light absorption is crucial for various photonic applications.
Purpose of the Study:
- To demonstrate a tunable, wide-angle, and polarization-independent absorber in the mid-infrared spectrum.
- To investigate the thermal emission properties of the designed structure.
Main Methods:
- Fabrication of a two-layer system using heavily-doped silicon and germanium.
- Optical characterization of absorption spectra across mid-infrared wavelengths (5-12µm).
- Analysis of spectral tunability by varying dielectric layer thickness.
Main Results:
- Achieved strong-to-perfect absorption over a broad mid-infrared range (5-12µm).
- Demonstrated spectral control of absorption resonance by adjusting dielectric layer thickness.
- Observed polarization-independent and angle-invariant absorption characteristics.
- Observed selective thermal emission upon heating.
Conclusions:
- The proposed two-layer system offers a versatile platform for mid-infrared absorption and thermal emission.
- The design shows excellent agreement with analytical models, validating its performance.
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