Photonic molecule
Theoretical natural state of matter / From Wikipedia, the free encyclopedia
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Photonic molecules are a form of matter in which photons bind together to form "molecules".[1][2][3] They were first predicted in 2007. Photonic molecules are formed when individual (massless) photons "interact with each other so strongly that they act as though they have mass".[4] In an alternative definition (which is not equivalent), photons confined to two or more coupled optical cavities also reproduce the physics of interacting atomic energy levels, and have been termed as photonic molecules.
Researchers drew analogies between the phenomenon and the fictional "lightsaber" from Star Wars.[4][5]