Sign of the refractive index in a gain medium with negative permittivity and 
permeability

Chen, Yi-Fan; Fischer, Peer; Wise, Frank W.

doi:10.1364/JOSAB.23.000045

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Sign of the refractive index in a gain medium with negative permittivity and permeability

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Fischer, Peer
Max Planck Institute for Medical Research, Max Planck Society;

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https://opg.optica.org/josab/abstract.cfm?uri=josab-23-1-45
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Citation

Chen, Y.-F., Fischer, P., & Wise, F. W. (2006). Sign of the refractive index in a gain medium with negative permittivity and permeability. Journal of the Optical Society of America B-Optical Physics, 23(1), 45-50. doi:10.1364/JOSAB.23.000045.

Cite as: https://hdl.handle.net/21.11116/0000-000B-002B-5

Abstract

We show how the sign of the refractive index in any medium may be derived using a rigorous analysis based on Einstein causality. In particular, we consider left-handed materials, i.e., media that have negative permittivities and permeabilities at the frequency of interest. We find that the consideration of gain in such media can give rise to a positive refractive index.