Near-field imaging of a square-lattice metallic photonic-crystal slab at the second band |
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Authors: | Feng Shuai Feng Zhi-Fang Ren Kun Ren Cheng Li Zhi-Yuan Cheng Bing-Ying and Zhang Dao-Zhong |
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Affiliation: | Institute of Physics, Chinese Academy of Sciences,Beijing National Laboratory for Condensed Matter Physics, Beijing 100080, China |
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Abstract: | Imaging properties of a two-dimensional photonic crystal slab lens are
investigated through the finite-difference time-domain method. In this
paper, we consider the photonic crystal slab consisting of a square lattice
of square metallic rods 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 photonic crystal slab, we find
that a good-quality image can form at the frequencies in the second
TM-polarized photonic band. Comparing the images formed at different
frequencies, we can clearly see that an excellent-quality image is formed by
the mechanisms of simultaneous action of the self-collimation effect and the
negative-refraction effect. |
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Keywords: | negative refraction photonic crystal |
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