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The remarkable feat of tying light in knots has been achieved by a team of physicists working at the universities of Bristol, Glasgow and Southampton, UK, reports a paper in Nature Physics this week.
Understanding how to control light in this way has important implications for laser technology used in wide a range of industries.
"In a light beam, the flow of light through space is similar to water flowing in a river. Although it often flows in a straight line -- out of a torch, laser pointer, etc -- light can also flow in whirls and eddies, forming lines in space called 'optical vortices'.
Optical vortices can be created with holograms which direct the flow of light. In this work, the team designed holograms using knot theory -- a branch of abstract mathematics inspired by knots that occur in shoelaces and rope. Using these specially designed holograms they were able to create knots in optical vortices.
Originally posted by WeAreAllGod
actually they're tying optical vortices into knots. In an optical vortex the intensity of the light is zero so this means they're actually tying dark into knots.