It's almost a song lyric: Diamonds in the sky with with laser beams.
Nick Vamivakas, an assistant professor of optics at the University of Rochester, led an experiment in which he and his team hit a nanometer-sized piece of diamond with a laser and levitated it. On top of that, the laser made it glow green. The work was published in the journal Optics Express.
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To make the diamond float, Vamivakas and his team fired a laser into a vacuum chamber, and focused the beam to a tiny point. They then sent a cloud of diamond particles into the chamber.
Laser beams - and light generally - can exert force on objects, but we don't usually feel it because most things are so heavy the force from light doesn't matter. But the diamonds were so tiny that they could be pushed and pulled by the laser beam. Out of the cloud of diamond particles, one was attracted to the point where the laser beam was focused, and got trapped in place. They fired a second laser at the diamond to make it glow.