We present the design and analysis of subwalength lenses based on air cylindrical waveguides surrounded by metal for the focusing of light in very small areas. The lenses are composed by several concentrically disposed air-metal waveguides with different widths in order to control the phase shift ing necessary to focus the light. The lenses we designed to operate at visible frequencies then, the propagation mechanism of light along the air-metal waveguides is obtained by the surface plasmon polaritons (SPPs). The structures have been analyzed by an efficient finite element formulation in cylindrical coordinates with perfectly matched layer (PMLs). ©2009IEEE. 725728Shi, H., Wang, C., Du, C., Luo, X., Dong, X., Gao, H., Beam manipulating by metallic nano-slits with variant widths (2005) Opt. Express, 13, pp. 6815-6820Engheta, N., Salandrino, A., Alu, A., Circuit Elements at Optical Frequencies: Nanoinductors, Nanocapacitors, and Nanoresistors (2005) Physical Review Letters, 95, p. 095504. , AugustMerlin, R., Radiationless Electromagnetic Interference: Diffractive Evanescent-Field Lenses and Perfect Focusing (2007) Science, 317, pp. 927-929. , AugustGrbic, A., Merlin, R., Near-Field Focusing Plates and Their Design (2007) IEEE Transaction on Antennas and Propagation, 56, pp. 3159-3165. , OctoberXu, T., Du, C.L., Wang, C.T., Luo, X.G., Subwavelength imaging by the metallic slab lens with nanoslits (2007) Appl. Phys. Lett., 91, p. 201501Rubio-Mercedes, C.E., Rodriguez-Esquerre, V.F., Ferreira Frasson, A.M., Hernandez-Figueroa, H.E., Novel FEM Approach for the Analysis of Cylindrically Symmetric Photonic Devices (2009) IEEE/OSA Journal of Ligthwave and Technology, p. 05. , accepted for publication