When does the choice of the refractive index of a linear, homogeneous, isotropic, active, dielectric medium matter?

Abstract

Two choices are possible for the refractive index of a linear, homogeneous, isotropic, active, dielectric material. Either of the choices is adequate for obtaining frequency-domain solutions for (i) scattering by slabs, spheres, and other objects of bounded extent; (ii) guided-wave propagation in homogeneously filled, cross-sectionally uniform, straight waveguide sections with perfectly conducting walls; and (iii) image formation due to flat lenses. The correct choice does matter for the half-space problem, but that problem is not realistic.

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Cited by in corpus (4)

• On the electromagnetic properties of active media
• $\mathcal{P}\mathcal{T}$-Symmetry-Induced Wave Confinement and Guiding in Epsilon-Near-Zero Metamaterials
• Harnessing Spectral Singularities in Non-Hermitian Cylindrical Structures
• Enhanced propagation of photon density waves in random amplifying media