摘要
This paper studies the focusing properties of a two-dimensional photonic crystal （PC） slab consisting of a triangular lattice of metallic cylinders immersed in a dielectric background. Through the analysis of the equifrequency-surface contours and the field patterns of a point source placed in the vicinity of the PC slab, it finds that both the image distance and image quality can be controlled by simply adjusting the refractive index of the background material.
This paper studies the focusing properties of a two-dimensional photonic crystal （PC） slab consisting of a triangular lattice of metallic cylinders immersed in a dielectric background. Through the analysis of the equifrequency-surface contours and the field patterns of a point source placed in the vicinity of the PC slab, it finds that both the image distance and image quality can be controlled by simply adjusting the refractive index of the background material.
基金
Project supported by the National Key Basic Research Special Foundation of China （Grant Nos 2004CB719804 and 2001CB610402）, the National Natural Science Foundation of China （Grant Nos 10404036 and 10674185）. The Support from the Supercomputing Center, CNIC, CAS is Also Acknowledged.
