光悬浮纳米颗粒传感器的校准与能量测量

Calibration and energy measurement of optically levitated nanoparticle sensors.

作者信息

Hebestreit Erik, Frimmer Martin, Reimann René, Dellago Christoph, Ricci Francesco, Novotny Lukas

机构信息

Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland.

Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria.

出版信息

Rev Sci Instrum. 2018 Mar;89(3):033111. doi: 10.1063/1.5017119.

DOI:10.1063/1.5017119

PMID:29604723

Abstract

Optically levitated nanoparticles offer enormous potential for precision sensing. However, as for any other metrology device, the absolute measurement performance of a levitated-particle sensor is limited by the accuracy of the calibration relating the measured signal to an absolute displacement of the particle. Here, we suggest and demonstrate calibration protocols for levitated-nanoparticle sensors. Our calibration procedures include the treatment of anharmonicities in the trapping potential, as well as a protocol using a harmonic driving force, which is applicable if the sensor is coupled to a heat bath of unknown temperature. Finally, using the calibration, we determine the center-of-mass temperature of an optically levitated particle in thermal equilibrium from its motion and discuss the optimal measurement time required to determine the said temperature.

摘要

光悬浮纳米粒子在精密传感方面具有巨大潜力。然而，与任何其他计量设备一样，悬浮粒子传感器的绝对测量性能受到将测量信号与粒子绝对位移相关联的校准精度的限制。在此，我们提出并演示了悬浮纳米粒子传感器的校准方案。我们的校准程序包括处理捕获势中的非谐性，以及一种使用谐波驱动力的方案，该方案适用于传感器与温度未知的热浴耦合的情况。最后，利用该校准，我们根据光悬浮粒子在热平衡状态下的运动确定其质心温度，并讨论确定上述温度所需的最佳测量时间。