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By doing time-domain simulations, we find the proposal fornegative-to-positive index switching proposed in [Physical Review Letters, 106105503 (2012)] may be fragile. The negative opinion on the uniform switching oflocal optical constants in our recent paper [arXiv:1111.1476v2] based on thecircuit model of metamaterials can therefore be verified in this specific andrealistic case.

Modulational instability of a recent nonlinear plasmonic metamaterial: Finite-difference-time-domain simulations