Superfluid focus: Schematic showing how a laser (green) is fired at a gold surface in a superfluid to create nanoparticles. The nanoparticles are then held in optical tweezers, which are created by focussing another laser (red) in the superfluid. (Courtesy: Yosuke Minowa/Osaka University)
Optical tweezers have been used to manipulate nanoparticles within superfluid helium at a chilly 1.4
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