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Appl. Sci. 2018, 8(4), 602; https://doi.org/10.3390/app8040602

Inducing Strong Non-Linearities in a Phonon Trapping Quartz Bulk Acoustic Wave Resonator Coupled to a Superconducting Quantum Interference Device

1
ARC Centre of Excellence for Engineered Quantum Systems, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia
2
FEMTO-ST Institute, CNRS, Univ. Bourgogne Franche Comte, ENSMM, 26 Chemin de l’Épitaphe, 25000 Besançon, France
*
Author to whom correspondence should be addressed.
Received: 22 March 2018 / Revised: 4 April 2018 / Accepted: 4 April 2018 / Published: 11 April 2018
(This article belongs to the Special Issue Brillouin Scattering and Optomechanics)
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Abstract

A quartz Bulk Acoustic Wave resonator is designed to coherently trap phonons in such a way that they are well confined and immune to suspension losses so they exhibit extremely high acoustic Q-factors at low temperature, with Q × f products of order 10 18 Hz. In this work we couple such a resonator to a Superconducting Quantum Interference Device (SQUID) amplifier and investigate effects in the strong signal regime. Both parallel and series connection topologies of the system are investigated. The study reveals significant non-Duffing response that is associated with the nonlinear characteristics of Josephson junctions. The nonlinearity provides quasi-periodic structure of the spectrum in both incident power and frequency. The result gives an insight into the open loop behaviour of a future Cryogenic Quartz Oscillator in the strong signal regime. View Full-Text
Keywords: BAW Resonator; SQUID; phonon trapping; low noise oscillator; non-linear coupling BAW Resonator; SQUID; phonon trapping; low noise oscillator; non-linear coupling
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Goryachev, M.; Ivanov, E.N.; Galliou, S.; Tobar, M.E. Inducing Strong Non-Linearities in a Phonon Trapping Quartz Bulk Acoustic Wave Resonator Coupled to a Superconducting Quantum Interference Device. Appl. Sci. 2018, 8, 602.

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