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Simultaneous Control of Spectral And Directional Emissivity with Gradient Epsilon-Near-Zero InAs Photonic Structures
Jae S Hwang1, Jin Xu1, Aaswath P Raman1,2
1Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.
Advanced Materials (Deerfield Beach, Fla.)
|July 19, 2023
Summary
Researchers developed a new photonic approach using doped semiconductors to precisely control infrared thermal radiation. This method enhances spectral bandwidth and directionality for advanced heat transfer and sensing applications.
Area of Science:
- Photonics
- Materials Science
- Infrared Technology
Background:
- Controlling spectral bandwidth and directionality of thermal radiation is crucial in photonics.
- Gradient epsilon-near-zero (ENZ) materials offer broad spectrum directionality but are limited by material properties.
- Existing methods face limitations in tailoring infrared emissivity spectrally and directionally.
Purpose of the Study:
- To design and demonstrate a novel approach for simultaneously controlling spectral peak, bandwidth, and directionality of infrared emissivity.
- To overcome limitations of existing materials for long-wave infrared applications.
- To provide a versatile photonic platform for dynamic control of thermal radiation.
Main Methods:
- Utilized doped III-V semiconductors to create gradient ENZ photonic structures.
- Epitaxially grew and characterized Indium Arsenide (InAs)-based structures.
- Varied doping concentration profiles and film thickness to tune emissivity properties.
Main Results:
- Demonstrated broadband directional emission from InAs-based gradient ENZ photonic structures.
- Showcased tunable spectral bandwidths and directional ranges based on doping and thickness.
- Achieved dynamic control over infrared emissivity characteristics.
Conclusions:
- The developed approach offers a versatile and easily fabricated photonic platform.
- This method enables precise control over broadband spectral and directional emissivity.
- The technology has potential applications in advanced heat transfer and infrared sensing.
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