Modeling and experimental exploration of the underdamped motion of microbeads in optical tweezers
Modeling and experimental exploration of the underdamped motion of microbeads in optical tweezers
复制标题
光镊中微珠欠阻尼运动的建模和实验探索
DOI：
10.1117/12.2530017
复制
发表时间：
2019
影响因子：
1.6
通讯作者：
M. Haghshenas
中科院分区：
文献类型：
--
作者：
A. Bowling;Vatsal Joshi;M. Haghshenas
本文研究了微珠向光阱焦点运动时的欠阻尼运动。本文所用的模型代表了一种新的方法来解决奇异摄动问题的动力学。实验涉及在光镊/陷阱的焦点处捕获微珠。光阱可以仅在两个方向上精确地测量微珠的位置。在给定实验数据的情况下，该模型可以用来估计珠子在第三方向上的位置。该估计允许检查珠的完整位置、速度和加速度，这又允许调查其颗粒雷诺数（Rep）。通常认为，低Rep意味着小珠将表现出过阻尼运动。本文中获得的三个珠直径，1950 nm，990 nm和500 nm的速度估计，提供了新的见解的解释低Rep在实验中观察到的欠阻尼运动。
This paper investigates the underdamped motion of a bead as it moves toward the focal point of an optical trap. The model used herein represents a new approach toward addressing singular perturbation problems in dynamics. The experiments involve trapping microbeads at the focal point of an optical tweezer/trap. The optical trap can accurately measure the position of a microbead only in two directions. Given experimental data, the model can be used to estimate the bead’s position in the third direction. This estimate allows an examination of the full position, velocity and acceleration of the bead, which in turn allows and investigation of its particle Reynolds number (Rep). It is generally believed that a low Rep implies that a small bead will exhibit overdamped motion. The velocity estimates obtained herein for three bead diameters, 1950nm, 990nm and 500nm, provide new insights into the interpretation of a low Rep in light of the underdamped motion observed in experiments.
影响因子：
3.5
作者：
Mohanty SK;Mohanty KS;Berns MW
通讯作者：
Berns MW
影响因子：
16.6
作者：
Berner J;Müller B;Gomez-Solano JR;Krüger M;Bechinger C
通讯作者：
Bechinger C