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Bassiri, Riccardo; Hart, Martin; Byer, Robert L.; Borisenko, Konstantin B.; Evans, Keith; Fejer, Martin M.; Lin, Angie C.; MacLaren, Ian; Markosyan, Ashot S.; Martin, Iain W.; Route, Roger K.; Rowan, Sheila (2014)
Publisher: Institute of Physics Publishing Ltd.
Languages: English
Types: Unknown
Subjects: QD, TP

Classified by OpenAIRE into

arxiv: Condensed Matter::Materials Science
Ion-beam sputtered amorphous heavy metal oxides, such as Ta2O5, are widely used as the high refractive index layer of highly reflective dielectric coatings. Such coatings are used in the ground based Laser Interferometer Gravitational-wave Observatory (LIGO), in which mechanical loss, directly related to Brownian thermal noise, from the coatings forms an important limit to the sensitivity of the LIGO detector. It has previously been shown that heat-treatment and TiO2 doping of amorphous Ta2O5 coatings causes significant changes to the levels of mechanical loss measured and is thought to result from changes in the atomic structure. This work aims to find ways to reduce the levels of mechanical loss in the coatings by understanding the atomic structure properties that are responsible for it, and thus helping to increase the LIGO detector sensitivity. Using a combination of Reduced Density Functions (RDFs) from electron diffraction and Fluctuation Electron Microscopy (FEM), we probe the medium range order (in the 2-3 nm range) of these amorphous coatings.
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    • [1] Harry G M, Armandula H, Black E, Crooks DRM, et al. 2010 Appl. Opt. 45 1569
    • [2] Martin I W, Bassiri R, Nawrodt R, Fejer M M, et al. 2010 Class. Quantum Grav. 27 225020
    • [3] Harry G M, Abernathy M R, Becerra-Toledo A E, Armandula H, et al. 2007 Class. Quantum Grav. 24 405-415
    • [4] Bassiri R, Evans K, Borisenko K B, Fejer M M, et al. (2013) Acta Mat. 61 1070-1077, 2013
    • [5] Muller E, Abou-Ras D, 2004 Preparation of Cross-section Samples for Transmission Electron Microscopy (Swiss Federal Institute of Technology Zurich)
    • [6] Cockayne D J H 2007 Annu. Rev. Mater. Res. 37 159-87
    • [7] Bassiri R 2011 The Atomic Structure and Properties of Mirror Coatings for use in Gravitational Wave Detectors (University of Glasgow) Ph.D. Thesis
    • [8] Bassiri R, Borisenko K B, Cockayne D J H, Hough J, et al. 2011 App. Phys. Lett. 98 031904
    • [9] Treacy M M J and Gibson J M 1996 Acta Cryst. A 52 212
    • [10] Voyles P M and Muller D A 2002 Ultramicroscopy 93 147
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