A new method of probing mechanical losses of coatings at cryogenic temperatures

Serge Galliou; Samuel Deléglise; Maxim Goryachev; Leonhard Neuhaus; Gianpietro Cagnoli; Salim Zerkani; Vincent Dolique; Jérémy Bon; Xavier Vacheret; Philippe Abbé; Laurent Pinard; Christophe Michel; Thibaut Karassouloff; Tristan Briant; Pierre-François Cohadon; Antoine Heidmann; Michael E Tobar; Roger Bourquin

doi:10.1063/1.4972106

A new method of probing mechanical losses of coatings at cryogenic temperatures

Rev Sci Instrum. 2016 Dec;87(12):123906. doi: 10.1063/1.4972106.

Authors

Serge Galliou¹, Samuel Deléglise², Maxim Goryachev³, Leonhard Neuhaus², Gianpietro Cagnoli⁴, Salim Zerkani², Vincent Dolique⁴, Jérémy Bon¹, Xavier Vacheret¹, Philippe Abbé¹, Laurent Pinard⁴, Christophe Michel⁴, Thibaut Karassouloff², Tristan Briant², Pierre-François Cohadon², Antoine Heidmann², Michael E Tobar³, Roger Bourquin¹

Affiliations

¹ FEMTO-ST Institute, Univ. Bourgogne Franche-Conté, CNRS, ENSMM 25000 Besançon, France.
² Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 75005 Paris, France.
³ ARC Centre of Excellence for Engineered Quantum Systems, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
⁴ Laboratoire des Matériaux Avancés, CNRS/IN2P3, 69622 Villeurbanne, France.

PMID: 28040968
DOI: 10.1063/1.4972106

Abstract

A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coating nowadays. The approach is demonstrated for chromium, chromium/gold, and multilayer tantala/silica coatings. The Ta₂O₅/SiO₂ coating has been found to exhibit a loss angle lower than 1.6 × 10^-5 near 30 MHz at 4 K. The results are compared to the previous measurements.