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Porous metal-based multilayers for selective thermal emitters.

Shiwei Shu1, Lingxia Zheng, Hui Li

  • 1Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong

Optics Letters
|December 4, 2012
PubMed
Summary

We designed a selective thermal emitter using a metallic multilayered structure. This novel emitter exhibits a sharp emission edge in the near-infrared, ideal for thermal-photovoltaic applications.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Selective thermal emitters are crucial for energy conversion applications.
  • Controlling thermal emission spectra is key to improving device efficiency.
  • Near-infrared (near-IR) spectral control is particularly important for thermal-photovoltaic systems.

Purpose of the Study:

  • To numerically investigate a novel metallic multilayered structure for selective thermal emission.
  • To analyze the emission characteristics of the proposed structure across different polarizations and angles.
  • To assess the suitability of the designed emitter for thermal-photovoltaic applications.

Main Methods:

  • Numerical simulation of a multilayered structure comprising a graded antireflection layer, a porous middle layer, and a substrate.
  • Analysis of emissivity spectra for both transverse electric (TE) and transverse magnetic (TM) polarizations.
  • Investigation of angular dependence of the emission characteristics.

Main Results:

  • The proposed selective thermal emitter demonstrates a sharp emission edge in the near-IR, with emissivity dropping from >0.9 to <0.1.
  • This sharp emission edge is maintained for both TE and TM polarizations.
  • The emission characteristics remain nearly constant across a wide range of emission angles, indicating potential for isotropic emission.

Conclusions:

  • The designed metallic multilayered structure functions as an effective selective thermal emitter.
  • The observed angular stability of the emission edge makes it promising for isotropic thermal emission.
  • The ability to suppress emission below the bandgap is highly beneficial for thermal-photovoltaic energy conversion.