利用绝对重力加速度标定光镊的位移
Displacement calibration of optical tweezers with absolute gravitational acceleration
摘要：
近年来，真空中的光阱悬浮粒子在发展精密传感器和探索新物理方面显示出巨大的潜力。将检测到的信号与捕获颗粒的绝对位移相关联的校准的准确性是绝对测量性能的关键因素。本文提出并实验验证了一种新的基于真空中自由落体粒子的光镊校准方法，其中引入了引力加速度作为绝对参考。我们的工作提供了一个校准协议，具有很大的确定性和可追溯性，这是显着的，在提高精度的光学悬浮颗粒的基础上精密传感。
英文摘要：
In recent years, levitated particles of optical traps in vacuum have shown enormous potential in precision sensor development and searching for new physics. The accuracy of the calibration relating the detected signal to absolute displacement of the trapped particle is a critical factor for absolute measurement performance. In this paper, we suggest and experimentally demonstrate a novel calibration method for optical tweezers based on free-falling particles in vacuum, where the gravitational acceleration is introduced as an absolute reference. Our work provides a calibration protocol with great certainty and traceability, which is significant in improving the accuracy of precision sensing based on optically levitated particles.
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