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17 March 2023 Thermal emission of spinning photons from temperature gradients
Parry Chen, Chinmay Khandekar, Zubin Jacob, Yonatan Sivan
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Proceedings Volume PC12437, Photonic Heat Engines: Science and Applications V; PC1243704 (2023) https://doi.org/10.1117/12.2651665
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
The fluctuational electrodynamic investigation of thermal radiation from non-equilibrium or non-isothermal bodies remains largely unexplored because of severe numerical difficulties. Here, we employ fast calculations based on modal expansion to accelerate research at this frontier. We employ our formalism on a long silica wire held under temperature gradient within its cross section. We discover that the far-field thermal emission carries a nonzero spin which is constant in direction and sign, and interestingly, is transverse to the direction of the power flow. We establish the origin of this transverse spin as arising from the nonequilibrium intermixing of the modes of the wire, and not from any previously studied or intuitively expected origins such as chiral or nonisotropic materials and geometries, magnetic materials or fields, and mechanical rotations. This finding emitted heat radiation can prove useful for advancing the noninvasive thermal metrology or infrared imaging technique
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Parry Chen, Chinmay Khandekar, Zubin Jacob, and Yonatan Sivan "Thermal emission of spinning photons from temperature gradients", Proc. SPIE PC12437, Photonic Heat Engines: Science and Applications V, PC1243704 (17 March 2023); https://doi.org/10.1117/12.2651665
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KEYWORDS
Photons
Electrodynamics
Infrared imaging
Magnetism
Metrology
Numerical simulations
Silica
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