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 (1) , I. Maurin (1) , P. Chaves de Souza Segundo (1) , A. Laliotis (1) , D. de Sousa Meneses (2) , D. Bloch (1)

1 LPL - Laboratoire de Physique des Lasers
2 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation

Near-field thermal emission largely exceeds blackbody radiation, owing to spectrally sharp emission in surface polaritons. We turn the 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. The temperature evolution of the sapphire mode is demonstrated. The Cs sensor, sensitive to both dispersion and dissipation, suggests the polariton to be redshifted and sharper, as compared, up to 1100 K, to predictions from far-field sapphire emission, affected by birefringence and multiple resonances.

Mots clés: Near-Field Heat Transfer, Casimir-Polder, sapphire, surface polarition, surface mode resonance, dissipation, birefringence, optics of solids, ellipsometry

Domaines: Physique [physics]

J. C. de Aquino Carvalho, I. Maurin, P. Chaves de Souza Segundo, A. Laliotis, D. de Sousa Meneses, et al.. Spectrally Sharp Near-Field Thermal Emission: Revealing Some Disagreements between a Casimir-Polder Sensor and Predictions from Far-Field Emittance. Physical Review Letters, 2023, 131 (14), pp.143801. ⟨10.1103/PhysRevLett.131.143801⟩. ⟨hal-04228219⟩