标题： 使用光镊同时捕获、充电并在空气中测量微粒的电荷 显示英文标题

标题： Using optical tweezers to simultaneously trap, charge and measure the charge of a microparticle in air

摘要： 光学镊子被广泛用作一种高灵敏度工具，用于测量微米级粒子上的力。 一种这样的应用是测量粒子的电荷，这可以在液体、空气或真空中高精度地完成。 我们实验研究了捕获激光本身如何对这样的粒子进行电荷充电，在我们的实验中是一个$\sim 1\,\mathrm{\mu m\;SiO_2}$球体在空气中。 我们将充电机制建模为一个双光子过程，该过程以高保真度再现了实验数据。 显示英文摘要

摘要： Optical tweezers are widely used as a highly sensitive tool to measure forces on micron-scale particles. One such application is the measurement of the electric charge of a particle, which can be done with high precision in liquids, air, or vacuum. We experimentally investigate how the trapping laser itself can electrically charge such a particle, in our case a $\sim 1\,\mathrm{\mu m\;SiO_2}$ sphere in air. We model the charging mechanism as a two-photon process which reproduces the experimental data with high fidelity.