Abstract
Upon formation, radiative polaritons in thin oxide films or crystals emit radiation to the surrounding space. This radiation is confined in a small range of the microwave to far-infrared region of the electromagnetic spectrum, independently of the oxide chemistry. This work shows that the low-frequency radiation is blackbody radiation associated with a temperature directly related to the boson character of the radiative polaritons and to their amount. The proximity of this temperature to absolute zero Kelvin explains the confinement of the frequency. This phenomenon is named polariton evaporation.
Highlights
Radiative polaritons (RPs) were discovered in the late sixties [1]-[3] and recently gained attention due to their ability to explain optical and thermal properties of thin oxide films or crystals [4]-[11]
Radiative polaritons form upon the absorption of photons from infrared (IR) radiation by phonons in thin oxide films or crystals
Through IR absorption spectra, ωr provides the central frequency of the absorption peak, while ωi supplies the spread of the absorption peak around ωr [2] [3] [13], or half of the peak width
Summary
Radiative polaritons (RPs) were discovered in the late sixties [1]-[3] and recently gained attention due to their ability to explain optical and thermal properties of thin oxide films or crystals [4]-[11]. Radiative polaritons form upon the absorption of photons from infrared (IR) radiation by phonons in thin oxide films or crystals. It was recently found that the frequency ωi corresponds to the frequency of the experimentally observed low-frequency radiation emitted to the space surrounding the RP’s formation site [13]. Such radiation lasts as long as the exciting IR radiation illuminates the targeted thin oxide film or crystal. The existence of such low-frequency radiation, is so far only viewed as the consequence of the presence of ωi in one of the exponential terms in the expression for the polarization P ( x,t ) :
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