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Mass measurement of optically levitated microspheres using gravitational acceleration and electrostatic force
Applied Optics
|March 17, 2026
Summary
We developed a direct mass measurement method for optically levitated particles in a vacuum. This technique offers traceable nanogram-level precision for microsphere mass, improving sensor accuracy and enabling new physics research.
Area of Science:
- Optics
- Metrology
- Physics
Background:
- Optically levitated particles are crucial for precision sensors and new physics exploration.
- Current mass measurement uncertainties limit the accuracy and application of these systems.
Purpose of the Study:
- To present a novel method for direct mass measurement of trapped microspheres in a vacuum.
- To overcome the limitations of existing mass measurement techniques for levitated particles.
Main Methods:
- Utilized a weakly focused vertical levitation system under vacuum (10⁻⁵ mbar).
- Employed absolute gravitational acceleration and a known electric field force as references.
- Directly measured the mass of a trapped silica microsphere without prior property knowledge.
Main Results:
- Achieved traceable nanogram-level mass measurement of trapped microspheres.
- Demonstrated a mass measurement uncertainty of 3.1% in vacuum conditions.
- Established a calibration protocol for microsphere mass under vacuum.
Conclusions:
- The presented method enables accurate and traceable mass calibration for levitated microspheres.
- This advancement is vital for enhancing the reliability of sensing and metrology applications in optomechanical systems.
- Paves the way for improved precision sensors and exploration of new physics using levitated particles.
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