Abstract
We reinterpret our earlier letter [Opt. Lett. 32, 2939 (2007)] to demonstrate that the resolution it gives to the problem of the sign of the wave vector and the refractive index is valid for active media without instabilities but invalid otherwise.
Original language | English |
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Pages (from-to) | 1829 |
Number of pages | 1 |
Journal | Optics Letters |
Volume | 33 |
Issue number | 16 |
DOIs | |
State | Published - 15 Aug 2008 |
Externally published | Yes |