ENHANCED TRANSMITTANCE AND RESOLUTION OF PHOTONIC CRYSTAL FLAT LENS BY SURFACE-EDGE ENGINEERING

We proposed a novel two-dimensional (2D) photonic crystal (PC) flat lens based on the surface-edge engineering of a PC slab, operating as an n = -1 superlens at lambda = 1.55 mu m. The cross-section at the truncated edge of the flat lens is similar to an "anti-reflection grating", which is employed to reduce the reflectivity of propagative waves. The PC flat lens with a low reflectance of 1% was realized by the proposed truncated surface-edge for an InP/InGaAsP/InP 2D PC slab. The simulation results obtained with finite-difference time-domain (FDTD) method show that a PC flat super lens with a far-field resolution of 0.41 lambda and a high transmittance of 81.9% can be achieved by the engineering of the truncated surface-edge at hetero-interface.