金纳米粒子在viscous fluids中扩散的动态光散射光谱的并行外差探测
Parallel heterodyne detection of dynamic light scattering spectra from gold nanoparticles diffusing in viscous fluids
摘要：
我们开发了一种显微镜，旨在探测，使用一个平行的外差接收器，波动光谱的光准弹性散射的金纳米粒子扩散在粘性流体。所记录的光谱的截止频率与在宽范围的动态粘度（在室温下为水粘度的1至15倍）中从单散射形式主义预期的那些线性地按比例增加。我们的计划，使整体平均光学波动测量多散斑记录在低光，在时间频率高达10 kHz，与12 Hz的帧速率阵列检测器。
英文摘要：
We developed a microscope intended to probe, using a parallel heterodyne receiver, the fluctuation spectrum of light quasi-elastically scattered by gold nanoparticles diffusing in viscous fluids. The cutoff frequencies of the recorded spectra scale up linearly with those expected from single scattering formalism in a wide range of dynamic viscosities (1 to 15 times water viscosity at room temperature). Our scheme enables ensemble-averaged optical fluctuations measurements over multispeckle recordings in low light, at temporal frequencies up to 10 kHz, with a 12 Hz framerate array detector.
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