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Method for measuring surface potential of the test mass with an optically levitated charged microsphere
Applied Optics
|March 17, 2026
Summary
A novel method uses a levitated charged microsphere to precisely measure surface potential in gravitational experiments. This technique enhances surface potential mapping for improved precision gravitational measurements.
Area of Science:
- Precision Measurement
- Experimental Physics
- Surface Science
Background:
- Gravitational experiments require precise measurement of surface potential.
- Existing methods face limitations in sensitivity and resolution.
- Mapping surface potential is crucial for understanding fundamental physics.
Purpose of the Study:
- To introduce a novel measurement scheme for surface potential distribution.
- To investigate the factors influencing potential measurement sensitivity.
- To support advancements in precision gravitational experiments.
Main Methods:
- Utilizing an optically trapped, levitated charged microsphere (SiO2, 2 µm diameter).
- Acquiring charge via ion adsorption and adjusting it with a high-voltage supply.
- Monitoring harmonic motion with laser interferometry for parameter measurement and error analysis.
Main Results:
- Achieved expected force noise of 4.5×10⁻²² N/√Hz.
- Demonstrated measurement sensitivity of potential difference reaching 0.15 mV/√Hz.
- Identified key factors influencing measurement sensitivity: microsphere diameter, separation distance, net charge, and spring constant.
Conclusions:
- The proposed method offers a promising approach for high-precision surface potential mapping.
- This technique can significantly enhance the accuracy of precision gravitational experiments.
- Further development could lead to new insights in fundamental physics research.
