Generation of a two-dimensional limited-diffraction beam with self-healing ability by annular-type photonic crystals

Kurt H., Turduev M.

Journal of the Optical Society of America B: Optical Physics, vol.29, no.6, pp.1245-1256, 2012 (SCI-Expanded) identifier identifier


In this work, we present the design of a photonic structure for the generation of in-plane two-dimensional (2D) limited-diffraction beam. We have numerically investigated the characteristics of the light propagation passing through a 2D square-lattice annular-type photonic crystal shaped in an axicon configuration. Careful selection of the operating frequency as well as the optimization of the apex rod position creates a less diffracted beam whose transverse intensity profile closely resembles a zero-order Bessel function. The created beam dramatically resists against the spatial spreading over a propagation distance of 50 μm, after focusing with a spot size of ∼0.23 μm. The self-healing capability of the generated limited-diffraction beam is demonstrated by placing obstacles with different sizes and shapes along the optical axis. The two features that accompany with such beams, i.e., diffractionlimited propagation and reconstruction ability after encountering obstructions, may strengthen its usage in manipulation of light propagation in various environments. © 2012 Optical Society of America.