Method for the experimental measurement of bulk and shear loss angles in amorphous thin films

Method for the experimental measurement of bulk and shear loss angles in amorphous thin films
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非晶薄膜体积损失角和剪切损失角的实验测量方法

DOI:
10.1103/physrevd.101.042004
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
Menoni, Carmen S.
Menoni, Carmen S.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Vajente, Gabriele;Fazio, Mariana;Yang, Le;Gupta, Anchal;Ananyeva, Alena;Billinsley, Garilynn;Menoni, Carmen S.

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布朗热噪声是许多高精度计量应用(以及其他引力波探测器)灵敏度的限制因素。布朗噪声的起源可以追溯到用于高反射涂层的非晶材料的内摩擦。为了正确表征非晶态材料的内摩擦,需要分别考虑体积损失和剪切损失。在之前的大多数作品中,尽管没有任何第一原理动机,但两个损失角被认为是相等的。在这项工作中,我们提出了一种基于当前最先进的涂层衰荡测量系统来提取材料体积和剪切损失角的方法。我们还表明,对于掺杂二氧化钛的氧化钽(一种常用于引力波探测器涂层的材料),实验数据强烈支持具有两个不同且截然不同的损耗角的模型,而不是一个单一损耗角的简单情况。
Brownian thermal noise is a limiting factor for the sensitivity of many high precision metrology applications, among other gravitational-wave detectors. The origin of Brownian noise can be traced down to internal friction in the amorphous materials that are used for the high reflection coatings. To properly characterize the internal friction in an amorphous material, one needs to consider separately the bulk and shear losses. In most of previous works the two loss angles were considered equal, although without any first principle motivation. In this work we present a method that can be used to extract the material bulk and shear loss angles, based on current state-of-the-art coating ring-down measurement systems. We also show that for titania-doped tantala, a material commonly used in gravitational-wave detector coatings, the experimental data strongly favor a model with two different and distinct loss angles, over the simpler case of one single loss angle.
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