A wave is a wave is a wave. Unless its a particle, or a cat in a box, but that's another (quantum) story.
To freeze light without destroying it you need a type of crystal that can be put into a state of 'electromagnetically induced transparency', or EIT.
That's sciencese for 'this crystal is normally opaque, but a special combination of a magnetic field and a laser shining on it will make it transparent to one colour of light.
A guy with a laser, in a military lab. This has nothing to do with the story, it just looks cool.
Which is kind of a mouthful, and this is why researchers often fall back on scienceese.
That and it makes them sound clever.
Researchers form the Georgia Institute of Technology shone coloured light through a crystal while it was in a state of EIT, then switched the EIT off. This trapped the light inside the crystal for almost a minute - an enormous length of time if you're a light beam - and then they released it.
Most importantly they were able to retrieve an image they'd encoded into the beam, demonstrating that it hadn't been damaged or distorted b the process.
So far, so what?
Well the next generation of computers are widely expected to use light instead of electricity - so a way of storing that light, and information encoded on it, takes us one step closer to them.....