The superlensing phenomenon of light in photonic-crystal lens-like structures of finite sizes was studied. The wave field was calculated by using the multiple scattering method. The influences of the shapes and interior structures of the lens-like devices on their imaging characteristics were carefully examined numerically. The numerical results revealed that negative refraction is not directly related to the subwavelength imaging phenomenon. For the photonic crystal slab of square-lattice type, superlensing effect was found to be essentially a near field effect.
In this paper we study theoretically the superlensing phenomenon of light by photonic crystal structures. The light wave
at any space point is calculated by using the multiple scattering method. By carefully analyzing the influences of a
number of parameters on the imaging characteristics, we find that negative refraction is not directly related to the
subwavelength imaging phenomenon.