Abstract
Using the mechanical strong anisotropicα-quartz, measurements of radiation temperature as a function of phonon radiation power were performed for gold and copper radiators evaporated on theX- orZ-crystal face, respectively. The comparison with theoretical model calculations of phonon transmission across the interface yields agreement with the isotropic/anisotropic acoustic mismatch model. A strong increase in radiation temperature in comparison to linear emission models is observed at temperatures above about 40 K. We suppose that this effect is due to phonon back-scattering which leads to a back-heating of the metal film.
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Martinon, C., Weis, O. α-quartz as a substrate in thermal phonon radiation. Z Physik B 32, 259–263 (1979). https://doi.org/10.1007/BF01351502
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DOI: https://doi.org/10.1007/BF01351502