Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot

R P Cameron, W Löeffler, K D Stephan

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Abstract

We propose an antenna designed to generate monochromatic electromagnetic knots and other 'unusual electromagnetic disturbances' in the microwave domain. Our antenna is a spherical array of radiating dipolar elements configured to approximate the desired electromagnetic field near its centre. We show numerically that a specific embodiment of the antenna with a radius of 61.2 cm and only 20 element pairs driven at a frequency of 2.45 GHz can yield linked and torus-knotted electric and magnetic field lines approximating those of an 'electromagnetic tangle': a monochromatic electromagnetic knot closely related to the well-known Raada-Hopf type electromagnetic knots but simpler in its construction. The antenna could be used to locally excite plasmas.

Original languageEnglish
Article number064006
Number of pages7
JournalJournal of Optics (United Kingdom)
Volume23
Issue number6
Early online date27 Apr 2021
DOIs
Publication statusPublished - 13 May 2021

Keywords

  • monochromatic electromagnetic knots
  • torus-knotted electric
  • plasmas

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