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Related Concept Videos

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Related Experiment Video

Updated: Sep 16, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Spectrally Selective Thermal Emitter for Efficient Infrared Stealth Compatible with Microwave Absorption.

Yufei Ge1, Liang Peng2, Yongqiang Pang3

  • 1Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, P. R. China.

ACS Applied Materials & Interfaces
|July 4, 2025
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Researchers designed a spectrally selective thermal emitter for advanced infrared stealth. This material suppresses emissivity and temperature, reducing thermal signatures for enhanced stealth capabilities.

Keywords:
emissivityinfrared radiationmultilayerspectrally selectivethermal emitter

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Materials with spectral selectivity in the thermal infrared are crucial for applications like thermophotovoltaics, radiative cooling, and infrared stealth.
  • Existing infrared stealth technologies often rely on low-emissivity materials, which can be further improved through spectral engineering.

Purpose of the Study:

  • To design and demonstrate a spectrally selective thermal emitter for efficient infrared stealth.
  • To achieve simultaneous suppression of emissivity and temperature for enhanced thermal signature reduction.

Main Methods:

  • Utilized the intrinsic spectral properties of aluminum nitride combined with a fully dielectric multilayered band-pass filter for spectral engineering.
  • Fabricated a selective thermal emitter capable of operating from ambient temperature to 400 °C.
  • Integrated the dielectric selective thermal emitter with a microwave absorber to achieve infrared and radar-compatible stealth.

Main Results:

  • The emitter exhibits high emissivity (ε = 0.78) in the 5-8 μm non-atmospheric window for heat dissipation and low emissivity (ε = 0.29 in 3-5 μm, ε = 0.26 in 8-14 μm) in atmospheric windows.
  • Achieved a significant temperature reduction of 8.2 °C by enhancing heat dissipation.
  • Demonstrated superior infrared stealth performance compared to conventional low-emissivity materials.

Conclusions:

  • The developed spectrally selective thermal emitter effectively reduces thermal signatures for infrared stealth applications.
  • The fully dielectric structure offers a flexible and straightforward solution for engineering selective emission characteristics.
  • The integration with microwave absorbers provides a pathway towards compatible infrared and radar stealth solutions.