本文基于硅基底空气孔型二维光子晶体(photonic crystals)，提出了一种可以实现等效负折射和亚波长成像的结构。点光源通过三角形光子晶体出射后在两侧形成两个像点。通过在光子晶体两侧添加光栅，增加了光源的透过率，消除了旁斑对双重像点的影响。当光栅的空气带隙宽度w=0.76a 和到光子晶体的距离dg=0.1a 时，左侧像点image1的最小半宽度达到0.433λ，此时右侧像点image2 达到0.842λ，均小于入射波长。另外，当光源波长在3.19a 到3.26a范围内时，光子晶体可以实现宽光谱的双重亚波长成像。最后，根据点光源和双重像点的位置变化，求出了关于其坐标x, z 的相对关系。

A focusing structure which can achieve negative refraction and dual subwavelength imaging is proposed, which is based on two-dimensional (2D) photonic crystal (PC) which consisting of air holes in silicon. The light radiated from a point source can form two images through a triangular PC. The transmittance of light is increased and the side spot at image2 is eliminated by adding the gratings on the sides of the PC. When the air slit of gratings is w=0.76a and the distance between gratings and PC is dg=0.1a, the minimum half-width of the image1 reaches 0.433λ, the maximum half-width of image2 reaches 0.842λ, which are both lower than incident wavelength. In addition, the PC realizes wide-spectrum dual subwavelength imaging when the incident wavelength varies from 3.19a to 3.26a. The position formulas between images and point source are also demonstrated. Based on the results, we propose a new confocal system based on PC that can achieve subwavelength imaging.