Opt Lett. 2013 Nov 15;38(22):4923-6. doi: 10.1364/OL.38.004923.
We introduce a method for optical trap calibration that is suitable for viscoelastic material. The method is designed for use on experimental setups with two optical tweezers and is based on pulling a trapped particle with one trap while holding it with the other. No piezo stage is needed, and only one optical trap must be movable with galvo mirrors, piezo mirrors, or acousto-optical deflectors. The method combines advantages of commonly known PSD-fitting and fast-sweeping methods, allowing calibration of a completely fixed trap in a fluid of unknown viscosity/viscoelasticity. A detailed method description, a theoretical derivation, and an experimental comparison to other methods are reported.
我们介绍了一种适用于粘弹性材料的光阱校准方法。该方法专为具有两个光学镊子的实验设置而设计，基于用一个陷阱拉动被捕获的粒子，同时用另一个陷阱将其固定。不需要压电台，并且只需使用振镜、压电镜或声光偏转器移动一个光学陷阱。该方法结合了常用的 PSD 拟合和快速扫描方法的优点，允许在未知粘度/粘弹性的流体中校准完全固定的陷阱。本文详细介绍了该方法的描述、理论推导，并与其他方法进行了实验比较。
