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Narrowband diffuse thermal emitter based on surface phonon polaritons
Binze Ma1, Yun Huang1, Weiyi Zha1
1State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
This study introduces a novel narrowband, diffuse thermal emitter using germanium nanostructures on silicon carbide. This innovation enables precise spectral and spatial control for advanced infrared applications.
Area of Science:
- Nanophotonics
- Metamaterials
- Thermal Engineering
Background:
- Controlling thermal emission for spectral and spatial selectivity is crucial.
- Existing narrowband emitters are angle-sensitive, while diffuse emitters have low quality factors.
- Nanophotonic approaches offer potential solutions for simultaneous control.
Purpose of the Study:
- To demonstrate a simultaneous narrowband and diffuse thermal emitter.
- To achieve high quality factor and broad spatial emission.
- To explore tunability using phase change materials.
Main Methods:
- Fabrication of 80 nm thick germanium nanostructures on silicon carbide.
- Utilizing surface phonon polaritons for coherent emission.
- Characterization of spectral and angular emission properties.
Main Results:
- Achieved a high quality factor (Q=101) narrowband emission at ~10.9 μm.
- Demonstrated strong diffuse thermal emission with a 70° full angle at half maximum.
- Successfully tuned emission by replacing germanium with phase change materials like Ge2Sb2Te5 and In3SbTe2.
Conclusions:
- The developed nanostructure provides simultaneous narrowband and diffuse thermal emission.
- This technology offers new possibilities for engineering thermal radiation.
- Potential applications include infrared sources, radiative cooling, sensing, and photovoltaics.
