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arXiv · 1309.4832

Extremely Low Loss Phonon-Trapping Cryogenic Acoustic Cavities for Future Physical Experiments

S. Galliou·M. Goryachev·R. Bourquin·Ph. Abbé·J. -P. Aubry·M. E. Tobar
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Abstract

Low loss Bulk Acoustic Wave devices are considered from the point of view of the solid state approach as phonon-confining cavities. We demonstrate effective design of such acoustic cavities with phonon-trapping techniques exhibiting extremely high quality factors for trapped longitudinally-polarized phonons of various wavelengths. Quality factors of observed modes exceed 1 billion, with a maximum $Q$-factor of 8 billion and $Q\times f$ product of $1.6\cdot10^{18}$ at liquid helium temperatures. Such high sensitivities allow analysis of intrinsic material losses in resonant phonon systems. Various mechanisms of phonon losses are discussed and estimated.

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S. Galliou, M. Goryachev, R. Bourquin, Ph. Abbé, J. -P. Aubry, M. E. Tobar. 2013-09-19. Extremely Low Loss Phonon-Trapping Cryogenic Acoustic Cavities for Future Physical Experiments. https://doi.org/10.1038/srep02132

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