Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot
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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 Rañada–Hopf type electromagnetic knots but simpler in its construction. The antenna could be used to locally excite plasmas.
CitationCameron, R. P., Löffler, W., & Stephan, K. D. (2021). Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot. Journal of Optics, 23, 06.
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