title: Subwavelength imaging by a graded-index photonic-crystal flat lens in a honeycomb lattice.
abstract: The left-handed behavior of a photonic-crystal flat lens with a graded index in a honeycomb lattice is proposed and theoretically studied. The performance of the flat superlens imaging of this structure has been demonstrated by finite-difference time-domain simulations. The full width at half-maximum of the image decreases to 62% compared to that of the image of a photonic-crystal slab without a graded index. The evanescent waves can be amplified and propagate to the far-field range. The image is not limited to be near the interface. The canalization effect of this structure is analyzed, and the tolerance of the edge cut of the graded-index structure is pretty good.
authors: Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, China.
authors: Peng
authors: P
authors: Shi
authors: Kun
authors: K
authors: Huang
authors: Yong-ping
authors: YP
authors: Li