Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot

Cameron, R P and Löeffler, W and Stephan, K D (2021) Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot. Journal of Optics (United Kingdom), 23 (6). 064006. ISSN 0972-8821

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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.

    ORCID iDs

    Cameron, R P ORCID logoORCID: https://orcid.org/0000-0002-8809-5459, Löeffler, W and Stephan, K D;