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5 October 2023 Testing Newtonian gravity at the micron scale
Giorgio Gratta
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Proceedings Volume PC12649, Optical Trapping and Optical Micromanipulation XX; PC126490F (2023) https://doi.org/10.1117/12.2679203
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
An active experimental front in the modern study of Gravity is testing the (Newtonian) law of gravitation at the 1 μm – 100 μm length scale. Electromagnetic forces are several orders of magnitude stronger than gravity, and pose a formidable challenge in any experiment aiming to measure the latter. This work describes results from a platform based on optically trapped neutral microspheres that probes deviations from Newtonian gravity. In addition to improvements to a previous iteration of the experimental apparatus, we present a novel technique that allows further suppression of electromagnetic backgrounds. This technique, which relies an optomechanical force sensor, provides a complementary technique to previous searches that have largely relied on variations of mechanical springs.
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Giorgio Gratta "Testing Newtonian gravity at the micron scale", Proc. SPIE PC12649, Optical Trapping and Optical Micromanipulation XX, PC126490F (5 October 2023); https://doi.org/10.1117/12.2679203
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KEYWORDS
Electromagnetism
Microspheres
Sensors
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