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Physica B Condensed Matter

Subluminal and superluminal light propagation in a superconducting quantum circuit via Josephson coupling energy

Hamid Reza Hamedi

Published Mar 3, 2015• 2 citations
Publisher
DOI
10.1016/j.physb.2015.03.003

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We demonstrated superluminal light propagation with a negative group velocity of -5.7 m/s in a photorefractive Bi 12SiO20 crystal by using the dispersive phase coupling effect in a nondegenerate two-wave mixing process. To the best of our knowledge, this is the first experimental demonstration of superluminal light propagation at room temperature in solids by using a classical wave mixing technique. In addition, we showed the tunability of the group velocity of light between the negative (superluminal light) and the positive (subluminal light) by simply tuning the experimental conditions such as the frequency of the coupling beam, the incident intensity, and the externally applied electric fields.