First search for new forces at the micron scale using optically levitated microspheres

1 Sep 2021, 18:00
1h 30m
Poster Cosmology and particle physics Poster session 2


Alexander Fieguth (Stanford University)


We report on a search for non-Newtonian forces that couple to mass, with a characteristic scale of ${\sim}10~\mu$m, using an optically levitated microsphere as a precision force sensor. A silica microsphere trapped in an upward-propagating, single-beam, optical tweezer is utilized to probe for interactions sourced from a nanofabricated attractor mass with a density modulation brought into close proximity to the microsphere and driven along the axis of periodic density in order to excite an oscillating response. We obtain force sensitivity of ${<}10^{-16}~\rm{N}/\sqrt{\rm{Hz}}$. Separately searching for attractive and repulsive forces results in the constraint on a new Yukawa interaction of $|\alpha| > 10^8$ for $\lambda > 10~\mu$m. This is the first test of the inverse-square law using an optically levitated test mass of dimensions comparable to $\lambda$, a complementary method subject to a different set of system effects compared to more established techniques.

Reference to paper (DOI or arXiv) arXiv:2102.06848
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Primary authors

Alexander Fieguth (Stanford University) Dr. Akio Kawasaki (National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology) Mr. Charles Blakemore (Stanford University) Dr. Nadav Priel (Stanford University) Dr. Alexander Rider (SRI) Prof. Giorgio Gratta (Stanford University) Dr. Qidong Wang ( Institute of Microelectronics of the Chinese Academy of Sciences)

Presentation Materials

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