Journal
CLASSICAL AND QUANTUM GRAVITY
Volume 35, Issue 7, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6382/aaad7c
Keywords
dielectric coatings; tantala; gravitational wave detectors; thermal noise; ion-beam sputtering; magnetron sputtering; gravitational waves
Categories
Funding
- National Science Foundation [ECCS-1542152, PHY-0757058]
- UK Science and Technology Facilities Council (STFC) [ST/L000946/1, ST/L000938/1, ST/L003465/1, ST/N005422/1, ST/N005406/1]
- SUPA
- Royal Society
- Royal Society of Edinburgh
- University of Glasgow
- University of Strathclyde
- University of the West of Scotland
- Royal Society Research Fellowship
- Royal Society Industry Fellowship
- Wolfson Research Merit award
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de recherche Quebec, Nature et technologies (FQRNT)
- NSERC Discovery Grants
- [PHY-0823459]
- Science and Technology Facilities Council [ST/L000938/1, 1785610, ST/N005406/1, ST/M006913/1, ST/I001085/1, ST/L003465/1, ST/N005422/1, ST/M006735/1, ST/J000361/1, ST/L000938/1 Gravitational Waves, ST/L000946/1, Gravitational Waves, ST/N005406/2] Funding Source: researchfish
- STFC [ST/N005422/1, ST/J000361/1, ST/N005406/2, ST/N005406/1, ST/L000946/1, Gravitational Waves, ST/L003465/1, ST/M006735/1, ST/M006913/1, ST/I001085/1, 1785610, ST/L000938/1] Funding Source: UKRI
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Brownian thermal noise in dielectric multilayer coatings limits the sensitivity of current and future interferometric gravitational wave detectors. In this work we explore the possibility of improving the mechanical losses of tantala, often used as the high refractive index material, by depositing it on a substrate held at elevated temperature. Promising results have been previously obtained with this technique when applied to amorphous silicon. We show that depositing tantala on a hot substrate reduced the mechanical losses of the as-deposited coating, but subsequent thermal treatments had a larger impact, as they reduced the losses to levels previously reported in the literature. We also show that the reduction in mechanical loss correlates with increased medium range order in the atomic structure of the coatings using x-ray diffraction and Raman spectroscopy. Finally, a discussion is included on our results, which shows that the elevated temperature deposition of pure tantala coatings does not appear to reduce mechanical loss in a similar way to that reported in the literature for amorphous silicon; and we suggest possible future research directions.
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