Suppressing damping in a diamagnetically levitated dielectric sphere via charge neutralization

Achieving high sensitivity in acceleration or force sensing is a fundamental requirement in certain research domains, particularly for diamagnetically levitated micro-nano oscillators. The sensitivity is primarily limited by thermal noise, which is proportional to the damping of oscillator motion. In this article, we observed the damping caused by static charge in diamagnetically moving levitated dielectric. Then an innovative theoretical model was proposed and verified during the charge neutralization process. As a result, the total damping of dielectric's motion was reduced from 1.6 mHz to 0.17 mHz. Then our sensing system achieved the best sensitivity of acceleration sensing in diamagnetically levitated submillimeter-scale dielectric sphere to date, measuring (8.1 +/- 0.9) x10(-10) g/root Hz. The exploration in the analysis and suppression of damping and associated thermal noise holds promise for frontier research involving sensing with levitating dielectric.