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首页> 外文期刊>Physica, B. Condensed Matter >Heterodyne and homodyne detection in fluctuating smectic membranes by photon correlation spectroscopy at X-ray and visible wavelengths
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Heterodyne and homodyne detection in fluctuating smectic membranes by photon correlation spectroscopy at X-ray and visible wavelengths

机译：X射线和可见光波长处的光子相关光谱技术检测波动的近晶膜中的外差和零差

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摘要

We discuss heterodyne and homodyne detection in photon correlation spectroscopy (PCS) performed at X-ray and visible wavelengths. Fluctuating smectic membranes in a reflection geometry have been used as model systems. At X-ray wavelength (XPCS), under specular conditions a strong elastic signal is present that acts as a time-independent internal reference source. This leads to a transition from heterodyne detection at the specular ridge to homodyne detection off-specular giving rise to a difference in relaxation time of a factor 2. In addition by comparing similar propagating modes at the specular ridge (XPCS) and at off-specular positions (PCs with visible light), cos-like and cos(2)-like oscillations have been observed as expected for heterodyne and homodyne mixing, respectively. (C) 2004 Elsevier B.V. All rights reserved.
机译：我们讨论在X射线和可见光波长下进行的光子相关光谱（PCS）中的外差和零差检测。反射几何形状中波动的近晶膜已被用作模型系统。在X射线波长（XPCS）下，在镜面反射条件下会出现强的弹性信号，该信号充当时间无关的内部参考源。这导致从镜面高岭的外差检测过渡到镜外高差的零差检测，从而导致因子2的弛豫时间有所不同。此外，通过比较镜高岭（XPCS）和镜外高岭的相似传播模式分别观察到外差和零差混合的位置（具有可见光的PC），类似cos的振荡和类似cos（2）的振荡。 （C）2004 Elsevier B.V.保留所有权利。

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