用遍历布朗系综测量亚飞秒牛顿力场
Subfemtonewton force fields measured with ergodic Brownian ensembles
摘要：
我们表明，辐射压力力场可以测量和重建的分辨率$0.3$ fN（在$99.7\%$置信水平）使用遍历合奏过阻尼胶体粒子。出色的力分辨率水平是由大尺寸的统计系综提供的，该系综通过记录所有扩散粒子的所有位移而建立，而与轨迹和时间无关。这是唯一可能的，因为驱动粒子的噪声是热的，白色的和稳定的，所以胶体系统是遍历的，正如我们仔细验证的那样。使用各态历经的胶体分散体来执行外力的超灵敏测量不限于非保守的光学力场。因此，我们的实验让位于有趣的机会，在流体中的弱力测量的背景下。
英文摘要：
We demonstrate that radiation pressure force fields can be measured and reconstructed with a resolution of $0.3$ fN (at a $99.7\%$ confidence level) using an ergodic ensemble of overdamped colloidal particles. The outstanding force resolution level is provided by the large size of the statistical ensemble built by recording all displacements from all diffusing particles, regardless of trajectory and time. This is only possible because the noise driving the particles is thermal, white and stationary, so that the colloidal system is ergodic, as we carefully verify. Using an ergodic colloidal dispersion for performing ultra-sensitive measurements of external forces is not limited to non-conservative optical force fields. Our experiments therefore give way to interesting opportunities in the context of weak force measurements in fluids.
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