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. and Rowan, Sheila (2014) Investigating the medium range order in amorphous Ta2O5 coatings. In: Electron Microscopy and Analysis Group Conference 2013 (EMAG2013), University of York, York, UK, 3-6 September 2013. Published in: Journal of Physics: Conference Series, Volume 522 doi:10.1088/1742-6596/522/1/012043 ISSN 1742-6596.

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Abstract

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.

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Tantalum oxides, Metallic oxides -- Mechanical properties
Journal or Publication Title:	Journal of Physics: Conference Series
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	1742-6596
Official Date:	11 June 2014
Dates:	Date Event 11 June 2014 Published
Volume:	Volume 522
Article Number:	012043
DOI:	10.1088/1742-6596/522/1/012043
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	27 December 2015
Date of first compliant Open Access:	27 December 2015
Conference Paper Type:	Paper
Title of Event:	Electron Microscopy and Analysis Group Conference 2013 (EMAG2013)
Type of Event:	Conference
Location of Event:	University of York, York, UK
Date(s) of Event:	3-6 September 2013

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