Broadband nonreciprocal thermal emissivity and absorptivity

Komron J. Shayegan; Jae S. Hwang; Bo Zhao; Aaswath P. Raman; Harry A. Atwater

doi:10.1038/s41377-024-01520-3

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Broadband nonreciprocal thermal emissivity and absorptivity

Original Articles

- Broadband nonreciprocal thermal emissivity and absorptivity
- Light: Science & Applications Vol. 13, Issue 9, Pages: 1820-1827(2024)
- Affiliations：
  
  1.Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA, USA
  2.Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA
  3.Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, USA
  4.Department of Mechanical Engineering, University of Houston, Houston, TX, USA
- Author bio：
  
  Aaswath P. Raman (aaswath@ucla.edu)
  Harry A. Atwater (haa@caltech.edu)
- Funds：
- DOI：10.1038/s41377-024-01520-3
  CLC：
- Received：21 December 2023，
  
  Revised：01 June 2024，
  
  Accepted：2024-07-01，
  
  Published Online：24 July 2024，
  
  Published：30 September 2024
- Accepted：
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Shayegan, K. J. et al. Broadband nonreciprocal thermal emissivity and absorptivity. Light: Science & Applications, 13, 1820-1827 (2024).
DOI：

Shayegan, K. J. et al. Broadband nonreciprocal thermal emissivity and absorptivity. Light: Science & Applications, 13, 1820-1827 (2024). DOI： 10.1038/s41377-024-01520-3.

摘要

Abstract

A body that violates Kirchhoff's law of thermal radiation exhibits an inequality in its spectral directional absorptivity and emissivity. Achieving such an inequality is of fundamental interest as well as a prerequisite for achieving thermodynamic limits in photonic energy conversion

and radiative cooling

. Thus far

inequalities in the spectral directional emissivity and absorptivity have been limited to narrow spectral resonances

or wavelengths well beyond the infrared regime

. Bridging the gap from basic demonstrations to practical applications requires control over a broad spectral range of the unequal spectral directional absorptivity and emissivity. In this work

we demonstrate broadband nonreciprocal thermal emissivity and absorptivity

by measuring the thermal emissivity and absorptivity of gradient epsilon-near-zero InAs layers of subwavelength thicknesses (50 nm and 150 nm) with an external magnetic field. The effect occurs in a spectral range (12.5–16 μm) that overlaps with the infrared transparency window and is observed at moderate (1 T) magnetic fields.

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references

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