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22 August 2020 Experimental investigation of the topological charge of optical force in a solid dielectric
Xiang Xi, Jingwen Ma, Zhong-Hao Zhou, Xin-Xin Hu, Yuan Chen, Chang-Ling Zou, Chun-Hua Dong, Xiankai Sun
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Proceedings Volume 11463, Optical Trapping and Optical Micromanipulation XVII; 114630S (2020) https://doi.org/10.1117/12.2570674
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
The force exerted by electromagnetic fields is of fundamental importance in physics. Intense debates on the conventionally accepted Lorentz formulation and the recently suggested Einstein–Laub formulation still continue due to lack of experimental evidences. To distinguish these two formulations, we experimentally investigated the topological charge of optical force in a solid dielectric, and found that the force exerted by a Gaussian beam has components with topological charge of both 2 and 0, which agrees with neither the Lorentz nor Einstein–Laub formulation. Instead, we found a modified Helmholtz theory could explain our experimental results. This work not only contributes to the ultimate determination of the correct force formulation in classical electrodynamics, but also has broad and far-reaching impact on many subjects involving electromagnetic forces.
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Xiang Xi, Jingwen Ma, Zhong-Hao Zhou, Xin-Xin Hu, Yuan Chen, Chang-Ling Zou, Chun-Hua Dong, and Xiankai Sun "Experimental investigation of the topological charge of optical force in a solid dielectric", Proc. SPIE 11463, Optical Trapping and Optical Micromanipulation XVII, 114630S (22 August 2020); https://doi.org/10.1117/12.2570674
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KEYWORDS
Dielectrics
Solids
Electromagnetism
Electrodynamics
Gaussian beams
Physics
Special relativity
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