Spectrally Sharp Near-Field Thermal Emission: Revealing Some Disagreements between a Casimir-Polder Sensor and Predictions from Far-Field Emittance
arXiv:2309.15708 · doi:10.1103/PhysRevLett.131.143801
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.
Accepted (Aug 1, 2023) for publication in Physical Review Letters... The Supplematry Material (ref 62) appears at the end of the single document
References in corpus (9)
- Halving the Casimir force with conductive oxides
- Measuring Electric Fields From Surface Contaminants with Neutral Atoms
- Plasma vs Drude modelling of the Casimir force: beyond the proximity force approximation
- Casimir-Polder forces in the presence of thermally excited surface modes
- Temperature dependence of the dielectric permittivity of CaF2, BaF2 and Al2O3: application to the prediction of a temperature dependent van der Waals surface interaction exerted onto a neighbouring Cs (8P{3/2}) atom
- Selective Reflection Spectroscopy at the Interface between a Calcium Fluoride Window and Cs Vapour
- Near field radiative heat transfer between two nonlocal dielectrics
- A Tabulation and Critical Analysis of the Wavelength-Dependent Dielectric Image Coefficient for the Interaction Exerted by a Surface onto a Neighbouring Excited Atom
- Measurement of the Stark shift of the transitions in atomic cesium