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Negative refraction and subwavelength imaging of a photonic-crystal slab for the frequencies in the third band |
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| Authors: | Shuai Feng Cheng Ren Degang Xu Yiquan Wang |
| Institution: | 1. Academy of Science,Minzu University of China,Beijing 100081,China 2. School of Opto-Electronic Information Science and Technology,Yantai University,Yantai 264005,China 3. College of Precision Instruments and Opto-Electronic Engineering,Tianjin University,Key Laboratory of Opto-Electronic Information Science and Technology,Ministry of Education,Tianjin 300072,China |
| Abstract: | Negative refraction and subwavelength imaging properties of a two-dimensional (2D) photonic crystal (PC) slab are studied by the finite-difference time-domain method. The PC consists of a triangular lattice of air holes immersed in a dielectric. For a certain frequency range in the third photonic band, the directions of the group velocities and the phase velocities can be opposite, so the PC can work as a kind of negative refractive-index material. The light radiated from a point source can form a subwavele... |
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