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Studying thermal radiation with T matrices

Juan Diego Mazo-Vásquez1,2,3,*, Markus Nyman4, Marjan Krstić1, Lukas Rebholz1, Carsten Rockstuhl1,4, and Ivan Fernandez-Corbaton4,†

  • *Contact author: juan-diego.mazo-vasquez@mpl.mpg.de
  • †Contact author: ivan.fernandez-corbaton@kit.edu
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Phys. Rev. B 112, 054307 – Published 11 August, 2025

DOI: https://doi.org/10.1103/41m5-9ztm

Abstract

We introduce a basic formalism for computing thermal radiation by combining Waterman's T-matrix method with an algebraic approach to light-matter interactions. The formalism applies to nanoparticles, clusters thereof, and also molecules. In exemplary applications, we explore how a chiral structure can induce an imbalance in the circular polarization of thermal radiation. While the imbalance is rather small for a chiral molecule such as R-BINOL, a much larger imbalance is observed for an optimized silver helix of approximately 200 nm in size. Besides the directional Kirchhoff law used in this article, the formalism is suitable for implementing more nuanced theories, and also provides a straightforward path to the computation of thermal radiation spectra of astronomical objects moving at relativistic speeds with respect to the measurement devices.

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Corrections

8 September, 2025

Correction: A typographical error in the fifth paragraph of Sec. I and the first paragraph of Sec. II has been fixed.

Article Text

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Phys. Rev. B 112, 054307– Published 11 August, 2025
  • Received 29 April 2025
  • Revised 11 July 2025
  • Accepted 23 July 2025
  • Corrected 8 September 2025
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