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Abstract
Coating thermal noise is a fundamental limit for precision experiments based on optical and quantum transducers. In this review, after a brief overview of the techniques for coating thermal noise measurements, we present the latest worldwide research activity on low-noise coatings, with a focus on the results obtained at the Laboratoire des Matériaux Avancés. We report new updated values for the $ {{\rm Ta}_2}{{\rm O}_5} $, $ {{\rm Ta}_2}{{\rm O}_5} {-} {{\rm TiO}_2} $, and $ {{\rm SiO}_2} $ coatings of the Advanced LIGO, Advanced Virgo, and KAGRA detectors, and new results from sputtered $ {{\rm Nb}_2}{{\rm O}_5} $, $ {{\rm TiO}_2} {-} {{\rm Nb}_2}{{\rm O}_5} $, $ {{\rm Ta}_2}{{\rm O}_5} {-} {{\rm ZrO}_2} $, $ {{\rm MgF}_2} $, $ {{\rm AlF}_3} $, and silicon nitride coatings. Amorphous silicon, crystalline coatings, high-temperature deposition, multi-material coatings, and composite layers are also briefly discussed, together with the latest developments in structural analyses and models.
© 2020 Optical Society of America
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