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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 ofair holes immersed in a dielectric. For a certain frequency range in the third photonic band, the directionsof the group velocities and the phase velocities can be opposite, so the PC can work as a kind of negativerefractive-index material. The light radiated from a point source can form a subwavelength image spotthrough the PC slab. Negative refraction and an effective refractive index of the PC slab n = -1 can beachieved for the incident wave with its incident angle within a certain range.
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 negativerefractive-index material. The light radiated from a point source can form a subwavelength image spotthrough the PC slab Negative refraction and an effective refractive index of the PC slab n = -1 can beachieved for the incident wave with its incident angle within a certain range.