超透镜是基于超表面对光场调控的成像器件，由于其具有体积小型化、工艺流程化的优势，在器件轻量化、便携性方面具有很好的应用前景。针对当前市场对透镜的体积需求，使用时域有限差分法模拟了一种新型结构的超透镜，它是基于光子晶体的平板超透镜，尺寸为长2 μm，宽1 μm，工作波长在717 nm可见光波段。该平板超透镜以TiO₂波导作为衬底，由Au和GaP两组周期相同的光子晶体呈相切的结构共同蚀刻在TiO₂波导上，模拟研究透镜成像效果。此外通过引入一系列不同形状的缺陷，研究其对平板透镜成像结果的影响，结果表明，当缺陷结构为矩形尺寸：Lx = 0.5 μm，Ly = 0.8 μm时，该平板超透镜呈现出最好的成像效果，达到了0.556 λ数值的超分辨，极大地提高了成像质量。未来该平板超透镜在可便携的成像设备，AR，VR以及小型医疗设备等各个领域具有极大的发展潜力。

Superlens is an imaging device based on metasurface photoregulation. Due to its advantages of miniaturization and process, it has a good application prospect in the aspects of lightweight and portability. In order to meet the demand of lens volume in the current market, a new type of superlens is simulated by using the finite-difference time-domain method. It is a flat plate superlens based on photonic crystal. The size is 2 μm×1 μm, and its working wavelength is in the visible light band of 717 nm. In this design, TiO₂ waveguide was used as the substrate for the plate superlens design. Two groups of Au and GaP photonic crystals with the same period are etched on the TiO₂ waveguide, and the imaging performance of the lens is simulated and studied. In addition, by introducing a series of defects with different shapes, the imaging performance of the plate lens is analyzed. The results show that when the defect structure is a rectangular size of Lx=0.5 μm, Ly=0.8 μm, the plate superlens presents the best imaging performance and reaches the value of 0.556λ super-resolution, which greatly improves the imaging quality. The flat superlens has great potential in portable imaging devices, AR, VR, and small medical devices in the future.