Control and measurement of electric dipole moments in levitated optomechanics
Control and measurement of electric dipole moments in levitated optomechanics
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DOI：
10.1103/physreva.104.053512
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发表时间：
2021-11-10
影响因子：
2.9
通讯作者：
Moore, David C.
中科院分区：
文献类型：
--
作者：
Afek, Gadi;Monteiro, Fernando;Moore, David C.
悬浮光学机械系统正在迅速成为精密传感的主要工具，能够对传感器的质心运动、旋转和电荷状态进行高水平的控制。然而，电荷分布中的高阶多极矩仍然是背景的主要来源。通过对真空中悬浮微球的偶极矩施加受控的行进力矩，我们证明了偶极感应背景的消除可达2个数量级。我们测量了纳克质量球的偶极矩，并确定了它们随球大小的变化，发现主要的力矩来自与SiO_2球的介电损耗性质有关的感生偶极矩。控制悬浮传感器电荷分布中的多极矩是在未来的应用中充分减少背景源的关键要求。
Levitated optomechanical systems are rapidly becoming leading tools for precision sensing, enabling a high level of control over the sensor's center-of-mass motion, rotation, and electric charge state. Higher-order multipole moments in the charge distribution, however, remain a major source of backgrounds. By applying controlled precessive torques to the dipole moment of a levitated microsphere in vacuum, we demonstrate cancellation of dipole-induced backgrounds by 2 orders of magnitude. We measure the dipole moments of nanogram-mass spheres and determine their scaling with sphere size, finding that the dominant torques arise from induced dipole moments related to dielectric-loss properties of the SiO2 spheres. Control of multipole moments in the charge distribution of levitated sensors is a key requirement to sufficiently reduce background sources in future applications.