An interesting read See: "Tranformation Optics and Subwavelength Control of Light", J. B. Pendry, A. Aurby, D. R. Smith, S. A. Maier; Science, volume 337 pages 549 to 552, 3 August 2012 www.sciencemag.org First Paragraph: "Our intuitive understand of light has it foundations in the ray approximation and is intimately connected with our vision. As far as our eyes are concerned, light behaves like a steam of particles. We look inside the wavelength and study the properties of plasmoic structures with dimensions of just a few nanometers, where at a tenth or even a hundredth of the wavelength of visible light the ray picture fails. We review the concept of transformation optics that manipulates electric and magnetic field lines, rather than rays; can provide an equally intuitive understanding of subwavelength phenomena; and at the same time can be an exact discription at the leverl of Maxwell's equations"