Spacetime geometries and light trapping in travelling refractive index perturbations

S. L. Cacciatori, F. Belgiorno, V. Gorini, G. Ortenzi, L. Rizzi, V. G. Sala, D. Faccio

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


In the framework of transformation optics, we show that the propagation of a locally superluminal refractive index perturbation (RIP) in a Kerr medium can be described, in the eikonal approximation, by means of a stationary metric, which we prove to be of Gordon type. Under suitable hypotheses on the RIP, we obtain a stationary but not static metric, which is characterized by an ergosphere and by a peculiar behaviour of the geodesics, which are studied numerically, also accounting for material dispersion. Finally, the equation to be satisfied by an event horizon is also displayed and briefly discussed.

Original languageEnglish
Article number095021
Pages (from-to)-
Number of pages14
JournalNew Journal of Physics
Publication statusPublished - 30 Sept 2010


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