Measurement of Mechanical Deformations Induced by Enhanced Electromagnetic Stress on a Parallel Metallic-Plate System

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  • M. Wang
  • S. Wang
  • Q. Zhang
  • C. T. Chan
  • H. B. Chan

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Original languageEnglish
Article number035502
Journal / PublicationPhysical Review Letters
Issue number3
Online published17 Jul 2018
Publication statusPublished - 20 Jul 2018


We measured the electromagnetic stress-induced local strain distribution on a centimeter-sized parallel-plate metallic resonant unit illuminated with microwave radiation. Using a fiber interferometer, we found that the strain changes sign across the resonant unit, in agreement with theoretical predictions that the attractive electric and repulsive magnetic forces act at different locations. The enhancement of the corresponding maximum local electromagnetic stress is stronger than the enhancement of the net force, reaching a factor of >600 compared to the ordinary radiation pressure.

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