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http://www.gizmag.com/solid-light-quantum-mechanics/33865/
Scientists have been observing the wave-particle duality of light for centuries, but never has light been seen to behave like matter. Until now, that is. Researchers at Princeton University have devised a method for giving light the properties of liquids and solids, with huge potential ramifications in the study of quantum mechanics and other areas of physics.
They are not, we should be clear, actually transforming light into a crystal, or any other form of matter – though turning light into matter and binding its photons together to form simple molecules are both being explored elsewhere. Rather, the research involved locking individual photons together in a lattice – what the researchers describe as "macroscopic quantum self-trapping" – such that they become like a solid or fluid object.
Scientists have been observing the wave-particle duality of light for centuries, but never has light been seen to behave like matter. Until now, that is. Researchers at Princeton University have devised a method for giving light the properties of liquids and solids, with huge potential ramifications in the study of quantum mechanics and other areas of physics.
They are not, we should be clear, actually transforming light into a crystal, or any other form of matter – though turning light into matter and binding its photons together to form simple molecules are both being explored elsewhere. Rather, the research involved locking individual photons together in a lattice – what the researchers describe as "macroscopic quantum self-trapping" – such that they become like a solid or fluid object.