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We propose a simple singularity-free coordinate transformation that could beimplemented in Maxwell's equations in order to simulate one aspect of a Kerrblack hole. Kerr black holes are known to force light to rotate in apredetermined direction inside the ergoregion. By making use of cosmologicalanalogies and the theoretical framework of transformation optics, we havedesigned a metamaterial that can make light behave as if it is propagatingaround a rotating cosmological massive body. We present numerical simulationsinvolving incident Gaussian beams interacting with the materials to verify ourpredictions. The ergoregion is defined through the dispersion curve of theoff-axis permittivities components.

Ergoregion in Metamaterials Mimicking a Kerr Spacetime