The paper is mainly concerned with the study of negative refraction phenomenon dependent on the incident light frequency in 2D photonic crystal which consists of a hexagonal lattice of circular dielectric rods with Si. The result indicates that along with the accretion of incident light frequency, the angle of refractive light and negative refractive index in absolute terms become smaller gradually. This law offers an application of differentiating two close incident light frequencies. And a sample has been made successfully to realize negative refraction phenomenon.
Many changes of various parameters in photonic crystal cause changes of band structure and thus cause changes of light propagation through photonic crystal. The paper is mainly concerned with the study of negative refraction phenomenon dependent on wave guide width in 2D photonic crystal which consists of a hexagonal lattice of circular dielectric rods with Si. It is separately carried on the elaboration from three aspects: along with the accretion of wave guide width in photonic crystal, how the incident light frequency range in which the negative refraction phenomenon presents is changed; under identical incident light frequency, if the negative refraction phenomenon presents, then what the transformation of corresponding negative refractive index is ; if the value of refractive index of -1 is obtained, what the trend of e incident light frequency is.