Titania-doped tantala/silica coatings for gravitational-wave detection

Harry, G. M.; Abernathy, M. R.; Becerra-Toledo, Andres E.; Armandula, H.; Black, E.; Dooley, Kate; Eichenfield, Matt; Nwabugwu, Chinyere; Villar, A.; Crooks, D. R. M.; Cagnoli, G.; Hough, J.; How, Colin; MacLaren, Ian; Murray, P. G.; Reid, S.; Rowan, S.; Sneddon, P.; Fejer, M. M.; Route, R.; Penn, S.; Ganau, P.; Mackowski, Jean-Marie; Michel, C.; Pinard, L.; Remillieux, A.

doi:10.1088/0264-9381/24/2/008

Cited by 218 publications

(224 citation statements)

References 31 publications

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“…All coatings were heat-treated after deposition at 600 • C in air for 24 hours. Further details of the deposition process can be found in the literature for these coatings [7], and ion-beam sputtering in general [10].…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

“…The coating mechanical loss has been measured previously as described by Harry et al [7]. As these are multi-layer coating mechanical loss measurements, the mechanical loss values stated by Harry et al [7] include the loss associated with the SiO 2 component, as well as the loss associated with the Ti doped Ta 2 O 5 component.…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

“…As these are multi-layer coating mechanical loss measurements, the mechanical loss values stated by Harry et al [7] include the loss associated with the SiO 2 component, as well as the loss associated with the Ti doped Ta 2 O 5 component. However, any changes in the mechanical loss can be assumed to be the result of the changes to the Ti doping concentration, as this is the most significant variable during the manufacturing process.…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

“…Previous work has suggested that the mechanical loss of tantala coatings can be reduced by up to 40 % by doping with TiO 2 (titania) [7]. It has also been shown that the loss of tantala is temperature dependent [8], and that the temperature dependence of the loss in pure and titania doped tantala coatings is strongly dependent on post-deposition heat-treatment, with several lowtemperature mechanical loss peaks emerging as the heat-treatment temperature is increased [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Correlations between the mechanical loss and atomic structure of amorphous TiO2-doped Ta2O5 coatings

Bassiri¹,

Evans²,

Borisenko³

et al. 2013

Acta Materialia

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can drop by as much as 40 % when it is doped with TiO 2 . We use a combination of electron diffraction data and atomic modeling using molecular dynamics to probe the atomic structure of these coatings, and examine the correlations between changes in the atomic structure and changes in the mechanical loss of these coatings. Our results show the first correlation between changes in the mechanical loss and experimentally measured changes in the atomic structure resulting from variations in the level of TiO 2 doping in TiO 2 doped Ta 2 O 5 coatings, in that increased homogeneity at the nearest neighbour level appears to correlate with reduced mechanical loss. It is demonstrated that subtle but measurable changes in the nearest neighbour homogeneity in an amorphous material

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Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlations between the mechanical loss and atomic structure of amorphous TiO2-doped Ta2O5 coatings

Bassiri¹,

Evans²,

Borisenko³

et al. 2013

Acta Materialia

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“…Taking into account, that this gain is cumulative with the other proposed methods of reducing the coating thermal noise: in particular, broadened laser beams [42], better coating materials [43], coating structure optimization [44,45], it is quite possible that together all these methods will allow to push the coating thermal noise below the quantum noise.…”

Section: Discussionmentioning

confidence: 99%

Pass-through Mach-Zehnder topologies for macroscopic quantum measurements

Khalili

2011

Phys. Rev. D

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Several relatively small-scale experimental setups, aimed on prototyping of future laser gravitational-wave detectors and testing of new methods of quantum measurements with macroscopic mechanical objects, are under development now. In these devices, not devoted directly to the gravitational-wave detection, Mach-Zehnder interferometer with pass-through Fabry-Perot cavities in the arms can be used instead of the standard Michelson/Fabry-Perot one. The advantage of this topology is that it does not contain high-reflectivity end mirrors with multilayer coatings, which Brownian noise could constitute the major part of the noise budget of the Michelson/Fabry-Perot interferometers.We consider here two variants of this topology: the "ordinary" position meter scheme, and a new variant of the quantum speed meter.

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Annealing‐Induced Changes in the Atomic Structure of Amorphous Silica, Germania, and Tantala Using Accelerated Molecular Dynamics

Prasai

Bassiri

Cheng

et al. 2021

Physica Status Solidi (b)

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The effects of annealing on the atomic structures of SiO 2 , GeO 2 , and Ta 2 normalO 5 are investigated using accelerated molecular dynamics (MD) simulations. Using population annealing with Boltzmann resampling to expedite the MD simulations, it is shown that annealed models demonstrate subtle but statistically significant changes in the structure. Consistent with experiments, the simulations show that effects of annealing on the atomic structures of these amorphous oxides are more pronounced in the medium‐range order than in the short‐range order.

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Titania-doped tantala/silica coatings for gravitational-wave detection

Cited by 218 publications

References 31 publications

Correlations between the mechanical loss and atomic structure of amorphous TiO2-doped Ta2O5 coatings

Correlations between the mechanical loss and atomic structure of amorphous TiO2-doped Ta2O5 coatings

Pass-through Mach-Zehnder topologies for macroscopic quantum measurements

Annealing‐Induced Changes in the Atomic Structure of Amorphous Silica, Germania, and Tantala Using Accelerated Molecular Dynamics

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