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arXiv · 2309.15708

Spectrally Sharp Near-Field Thermal Emission: Revealing Some Disagreements between a Casimir-Polder Sensor and Predictions from Far-Field Emittance

J. C. de Aquino Carvalho·I. Maurin·P. Chaves de Souza Segundo·A. Laliotis·D. de Sousa Meneses·D. Bloch
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Abstract

Near-field thermal emission largely exceed blackbody radiation, owing to spectrally sharp emission in surface polaritons. We turn Casimir-Polder interaction between Cs(7P1/2) and a sapphire interface, into a sensor sharply filtering, at 24.687 THz, the near-field sapphire emission at ~ 24.5 THz. Temperature evolution of sapphire mode is demonstrated. The Cs sensor, sensitive to both dispersion and dissipation, suggests the polariton to be red-shifted and sharper, as compared, up to 1100 K, to predictions from far-field sapphire emission, affected by birefringence and multiple resonances.

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J. C. de Aquino Carvalho, I. Maurin, P. Chaves de Souza Segundo, A. Laliotis, D. de Sousa Meneses, D. Bloch. 2023-09-27. Spectrally Sharp Near-Field Thermal Emission: Revealing Some Disagreements between a Casimir-Polder Sensor and Predictions from Far-Field Emittance. https://doi.org/10.1103/physrevlett.131.143801

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