Spectral properties of thermalfluctuations on simple liquid surfacesbelow shot-noise levels
Spectral properties of thermalfluctuations on simple liquid surfacesbelow shot-noise levels
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散粒噪声水平以下简单液体表面热波动的光谱特性
DOI：
10.1103/physreve.86.011602
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Takahisa Mitsui
中科院分区：
文献类型：
--
作者：
Kenichiro Aoki;Takahisa Mitsui
我们研究简单液体表面上的热涨落的光谱特性，有时称为波动子。研究了谱函数的解析性质，表明谱函数是由具有关于频率或波数的简单解析行为的区域组成的。将推导出的表达式与在散粒噪声水平下进行数量级的光谱测量进行了比较，这是使用一种新的降噪方法实现的。表面热涨落的理论与实验之间的一致性很好，阐明了表面涨落的光谱特性。这种测量方法只需要相对较小的样本，无论是在空间上(Fwm)还是在时间上(S)。该方法还需要相对较弱的光功率(MW)，因此它具有广泛的适用性，包括局部测量、时间依赖现象的研究和非侵入性测量。
We study the spectral properties of thermal fluctuations on simple liquid surfaces, sometimes called ripplons. Analytical properties of the spectral function are investigated and are shown to be composed of regions with simple analytic behavior with respect to the frequency or the wave number. The derived expressions are compared to spectral measurements performed orders of magnitude below shot-noise levels, which is achieved using a novel noise reduction method. The agreement between the theory of thermal surface fluctuations and the experiment is found to be excellent, elucidating the spectral properties of the surface fluctuations. The measurement method requires relatively only a small sample both spatially (fewm) and temporally (s). The method also requires relatively weak light power (mW) so that it has a broad range of applicability, including local measurements, investigations of time-dependent phenomena, and noninvasive measurements.