most citedCausality-based criteria for a negative refractive index must be used with care

81 citations · 81 across the 1 of their papers we have counts for

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physics.optics2008★ 81 cited

Causality-based criteria for a negative refractive index must be used with care

P. Kinsler, M. W. McCall

Using the principle of causality as expressed in the Kramers-Kronig relations, we derive a generalized criterion for a negative refractive index that admits imperfect transparency…