On resolving the refractive index and the wave vector

Details On resolving the refractive index and the wave vector On resolving the refractive index and the wave vector

2006-07-12

arxiv.org/abs/physics/0607104v3

Optics Letters 31, pp. 3372-3374 (2006)

Physics

Optics

Scientific paper

10.1364/OL.31.003372

The identification of the refractive index and wave vector for general (possibly active) linear, isotropic, homogeneous, and non-spatially dispersive media is discussed. Correct conditions for negative refraction necessarily include the global properties of the permittivity and permeability functions $\epsilon=\epsilon(\omega)$ and $\mu=\mu(\omega)$. On the other hand, a necessary and sufficient condition for left-handedness can be identified at a single frequency ($\re\epsilon/|\epsilon|+\re\mu/|\mu|<0$). At oblique incidence to semi-infinite, active media it is explained that the wave vector generally loses its usual interpretation for real frequencies.

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