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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Published on: March 22, 2019

Transparent dynamic infrared emissivity regulators.

Yan Jia¹, Dongqing Liu², Desui Chen³

¹Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, P.R. China.

Nature Communications

|August 22, 2023

Summary

This study presents a novel electrically controlled infrared emissivity regulator. It independently modulates infrared radiation while maintaining high visible light transparency, enabling smart thermal management and camouflage applications.

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Dynamic infrared emissivity regulators are crucial for energy and information technologies.
Independent control of visible and infrared spectra is a key challenge for smart thermal management and multispectral camouflage.

Purpose of the Study:

To demonstrate an electrically controlled infrared emissivity regulator with independent visible and infrared spectral modulation.
To achieve high visible transparency alongside significant infrared emissivity regulation.

Main Methods:

Fabrication of an electrically controlled infrared emissivity regulator using aluminum-doped zinc oxide nanocrystals.
Characterization of visible transparency (84.7% at 400-760 nm).
Measurement of infrared emissivity regulation (0.51 at 3-5 μm, 0.41 at 7.5-13 μm), response time (<600 ms), and cycle life (>10^4 cycles).

Main Results:

Achieved independent modulation of infrared emissivity with high visible transparency.
Demonstrated significant infrared emissivity regulation across different infrared bands.
Exhibited fast response times and excellent long-term stability.

Conclusions:

The developed regulator offers independent control over infrared emissivity and visible transparency.
Modification of carrier concentration in aluminum-doped zinc oxide nanocrystals underlies the emissivity regulation.
This technology opens avenues for advanced smart thermal management, multispectral displays, and adaptive camouflage.