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 language | English |
|---|---|
| Article number | 064006 |
| Number of pages | 7 |
| Journal | Journal of Optics (United Kingdom) |
| Volume | 23 |
| Issue number | 6 |
| Early online date | 27 Apr 2021 |
| DOIs | |
| Publication status | Published - 13 May 2021 |
Keywords
- monochromatic electromagnetic knots
- torus-knotted electric
- plasmas