{"title":"Measurement of Acoustic Loss in Nano-Layered Coating Developed for Thermal Noise Reduction","authors":"E. Cesarini, M. Lorenzini, R. Cardarelli, S. Chao, E. Coccia, V. Fafone, Y. Minenkow, I. Nardecchia, I. M. Pinto, A. Rocchi, V. Sequino, C. Taranto","volume":113,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":597,"pagesEnd":602,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10004463","abstract":"<p>Structural relaxation processes in optical coatings represent a fundamental limit to the sensitivity of gravitational waves detectors, MEMS, optical metrology and entangled state experiments. To face this problem, many research lines are now active, in particular the characterization of new materials and novel solutions to be employed as coatings in future gravitational wave detectors. Nano-layered coating deposition is among the most promising techniques. We report on the measurement of acoustic loss of nm-layered composites (Ti<sub>2<\/sub>O\/SiO<sub>2<\/sub>), performed with the GeNS nodal suspension, compared with sputtered &lambda;\/4 thin films nowadays employed.<\/p>\r\n","references":"[1]\tMarshall W et al 2003 Phys Rev Lett 91 13040\r\n[2]\tNumata K, Kemery A, and Jordan Camp 2004 Phys. Rev. Lett. 93 250602\r\n[3]\tHeidmann A et al. 1997 Appl Phys B 64 173-180\r\n[4]\tF. Acernese et al., \u201cAdvanced Virgo: a second-generation interferometric gravitational wave detector,\u201d Class. Quantum Grav. 32, 024001, 2015.\r\n[5]\tJ. Aasi et al., \u201cAdvanced LIGO,\u201d Class. Quantum Grav. 32, 074001, 2015.\r\n[6]\tB. P. Abbott et al., \u201cObservation of Gravitational Waves from a Binary Black Hole Merger,\u201d Phys. Rev. Lett. 116, 061102, 2016.\r\n[7]\tH. B Callen and T. A. Welton, \u201cIrreversibility and Generalized Noise,\u201d Phys. Rev. 83, 34, 1951.\r\n[8]\tS. D. 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