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首页> 外文期刊>Mechanika >Research of Quartz Tuning Fork Tip Length Influence on the Shear Force Imaging in Liquids
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Research of Quartz Tuning Fork Tip Length Influence on the Shear Force Imaging in Liquids

机译：石英音叉尖端长度对液体剪切力成像影响的研究

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Shear force detection method has been widely used for regulating the tip-sample distance in scanning near-field optical microscopy (SNOM) since its implementation. In this technique, an optical fibre tip is fixed to a vibrating element, which is excited near its mechanical resonance frequency in such a way that the tip vibrates parallel (shear force mode) or perpendicular tapping mode) to the sample surface. As the tip approaches close to the sample surface, the tip-sample interaction forces experienced by the sensor are detected as a shift in resonance frequency and changes in vibrational amplitude and phase. These signals are used to maintain the tip-sample distance of the SNOM during scanning. The imaging performance of the dynamic distance control is mainly determined by the response sensitivity of the sensor to the tip-sample interaction forces. It has been shown that the minimum detectable force has an inverse dependence on the square root of the sensor's quality factor Q and dithering frequency [1, 2]. Sometimes the sensor has to be immersed in an aqueous medium. In these cases, the force detection sensitivity is considerably degraded owing to capillary and viscous damping. Therefore, imaging of such samples becomes difficult, especially in the shear force detection mode.
机译：自实施以来，剪切力检测方法已广泛用于调节扫描近场光学显微镜（SNOM）中的尖端样品距离。在该技术中，将光纤尖端固定到振动元件，该振动元件在其机械共振频率附近被激发，使得尖端平行于样本表面振动（剪切力模式或垂直敲击模式）。当尖端接近样品表面时，传感器所经历的尖端-样品相互作用力被检测为共振频率的变化以及振动幅度和相位的变化。这些信号用于在扫描过程中保持SNOM的尖端样本距离。动态距离控制的成像性能主要取决于传感器对尖端样品相互作用力的响应灵敏度。已经表明，最小可检测力与传感器品质因数Q的平方根和抖动频率成反比[1，2]。有时，传感器必须浸入水性介质中。在这些情况下，由于毛细管和粘性阻尼，力检测灵敏度会大大降低。因此，这种样品的成像变得困难，尤其是在剪切力检测模式下。

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