Negative Refraction Based Applications in Artificial Periodic Media

Abstract

In this chapter, we will address the potential applications of negative refraction in artificial periodic media. Different approaches will be considered depending on the targeted wavelength operation from microwaves down to optics. First, physical concepts to create such an abnormal propagation regime will be described: (i) negative permittivity and negative permeability engineering in patterned metallic or metallo-dielectric structures namely metamaterials and (ii) band structure engineering in full dielectric structures namely photonic crystals. Second, practical examples of real devices will be given, starting from negative refraction evidence in a two dimensional prism in microwaves, backward wave propagation in a periodically loaded transmission line to end with subwavelength focusing by a photonic crystal slab for optical waves. In the third part, other exciting properties beyond negative refraction will be evoked with the design of hyperlenses and cloaking devices.

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