Institute of Scientific Instruments of CAS, Královopolská 147, 612 64, Brno, Czech Republic.
Charles University, Faculty of Mathematics and Physics, Department of Macromolecular Physics, V Holešovičkách 2, 180 00, Praha 8, Czech Republic.
Sci Rep. 2017 May 10;7(1):1697. doi: 10.1038/s41598-017-01848-4.
Recent technological progress in a precise control of optically trapped objects allows much broader ventures to unexplored territory of thermal motion in non-linear potentials. In this work, we exploit an experimental set-up of holographic optical tweezers to experimentally investigate Brownian motion of a micro-particle near the inflection point of the cubic optical potential. We present two complementary views on the non-linear Brownian motion. On an ensemble of stochastic trajectories, we simultaneously determine (i) the detailed short-time position statistics and (ii) the long-distance first-passage time statistics. We evaluate specific statistical moment ratios demonstrating strongly non-linear stochastic dynamics. This is a crucial step towards a possible massive exploitation of the broad class of complex non-linear stochastic effects with objects of more complex structure and shape including living ones.
最近在精确控制光阱物体方面的技术进步，使得在非线性势中对热运动的未知领域进行更广泛的探索成为可能。在这项工作中，我们利用全息光镊实验装置，实验研究了微粒子在立方光学势拐点附近的布朗运动。我们提出了关于非线性布朗运动的两种互补观点。在随机轨迹的集合中，我们同时确定了（i）详细的短时间位置统计数据和（ii）长距离首次通过时间统计数据。我们评估了具体的统计矩比，展示了强烈的非线性随机动力学。这是朝着可能大规模利用具有更复杂结构和形状的物体（包括活体）的广泛的复杂非线性随机效应迈出的关键一步。
