Control and measurement of electric dipole moments in levitated optomechanics

• URL: http://arxiv.org/abs/2108.04406v3
• Date: Wed, 27 Oct 2021 01:58:33 GMT
• Title: Control and measurement of electric dipole moments in levitated optomechanics
• Authors: Gadi Afek, Fernando Monteiro, Benjamin Siegel, Jiaxiang Wang, Sarah Dickson, Juan Recoaro, Molly Watts and David C. Moore
• Abstract summary: Control of multipole moments in the charge distribution of levitated sensors is a key requirement to sufficiently reduce background sources in future applications. Control of multipole moments in the charge distribution of levitated sensors is a key requirement to sufficiently reduce background sources in future applications.
• Score: 51.52720563165496
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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 ng-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 SiO$_2$ spheres. Control of multipole moments in the charge distribution of levitated sensors is a key requirement to sufficiently reduce background sources in future applications.

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