By the numerical simulation based on the finite-difference time-domain method, we investigate the
adjustability of image distance for the same object distance in two-dimensional (2D) photonic crystals
(PCs). When we add a fraction of a metallic component to the center of each dielectric bar, the PC slab
lens can form a non-near- field image and the image distance changes for different surface terminations
formed by introducing cylinders at the surface layers whose geometric and physical parameters are
different from those of the PC bulk. Furthermore, the image distance can be further tuned by combining
the two kinds of cylinders at the surface layers with different ratios of slab length. These simulation
results clearly show that the imaging properties can be controlled effectively by changing the surface
termination of PC slab lenses.
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