Guiding electromagnetic energy below the diffraction limit with dielectric particle arrays

We demonstrate that electromagnetic energy can be efficiently guided along a single chain, around a corner, and split at forked structures below the diffraction limit with the use of appropriate dielectric particle arrays. The fields are confined to a region with the transverse width less than half of the guided wavelength. Our results give an explicit demonstration that the dielectric based subwavelength photonic circuit is achievable, providing an alternative to the surface-plasmon-based metallic counterpart.