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  • Letter
  • Open Access

Search for non-Newtonian interactions at micrometer scale with a levitated test mass

Charles P. Blakemore1, Alexander Fieguth1, Akio Kawasaki1,2,*, Nadav Priel1,†, Denzal Martin1, Alexander D. Rider1,‡, Qidong Wang3, and Giorgio Gratta1,2

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA
  • 2W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, California 94305, USA
  • 3Institute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, China

  • *akio.kawasaki@aist.go.jp Now at National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1–1–1 Umezono, Tsukuba, Ibaraki 305-8563, Japan.
  • †nadavp@stanford.edu
  • ‡Now at SRI International, Boulder, Colorado 80302
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Phys. Rev. D 104, L061101 – Published 2 September, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L061101

Abstract

We report on a search for non-Newtonian forces that couple to mass, with a characteristic scale of ∼10  μm, 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 a force sensitivity of ≲10−16  N/Hz. Separately searching for attractive and repulsive forces results in the constraint on a new Yukawa interaction of |α|≳108 for λ>10  μm. This is the first test of the inverse-square law using an optically levitated test mass of dimensions comparable to λ, a complementary method subject to a different set of systematic effects compared to more established techniques.

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Phys. Rev. D 104, L061101– Published 2 September, 2021
  • Received 12 February 2021
  • Accepted 22 July 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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