Subwavelength Focusing Properties of Diffractive Photonic Crystal Lens

Abstract

Subwavelength focusing properties of diffractive photonic crystal lens was considered. It was shown that photonic crystal lens design has not an unique solution and at least of three different types of photonic crystal lens are possible with spatial resolution at focus equal to FWHM = 0.48λ. PhC diffractive lens with mode transformation are also discussed. It was shown the lens focuses radiations to a spot smaller than the diffraction limit with FWHM = 0.35λ. In the second part we suggest a metamaterial based structure whose properties are determined not only by its inner geometry but also by its entire 3D shape. The example of metacuboid are described. We evaluate the potential of this structure to control both the size and the location of the field enhancement (photonic jet). Effect of EM strong localization in photonic crystal is described.