That's right, scientists have discovered a real-life lightsaber material "when they managed to get the particles to clump together to form a molecule, one that's unlike any other matter." What sets these photons apart is that during interaction, they're pushing against / deflecting each other, and the physics of what's happening in these molecules is similar to what we see in the movies. Continue reading for more information.
"Most of the properties of light we know about originate from the fact that photons are massless, and that they do not interact with each other," Lukin said.
This type of photonic bound state has been discussed theoretically for quite a while, but until now it hadn't been observed.
[Sources 1 | 2 | 3]