The change in the speed of light as it propagates through a moving material has been a subject of study for almost two centuries. This phenomenon, known as the Fresnel light-drag effect, is quite small and usually requires a large interaction path length and/or a large velocity of the moving medium to be observed. Here, we show experimentally that the observed drag effect can be enhanced by over 2 orders of magnitude when the light beam propagates through a moving slow-light medium. Our results are in good agreement with the theoretical prediction, which indicates that, in the limit of large group indices, the strength of the light-drag effect is proportional to the group index of the moving medium.
Publication Source (Journal or Book title)
Physical Review Letters
Safari, A., De Leon, I., Mirhosseini, M., Magaña-Loaiza, O., & Boyd, R. (2016). Light-Drag Enhancement by a Highly Dispersive Rubidium Vapor. Physical Review Letters, 116 (1) https://doi.org/10.1103/PhysRevLett.116.013601