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结合波状结构二维(2D)光子晶体(PC)与入射介质两者的等频面结构分析了PC内部的负折射现象,采用时域有限差分(FDTD)方法模拟了高斯光束在波状结构2DPC内的负折射,分别得到了折射角/入射角以及折射角/入射波长之间的关系曲线,当入射角为45°,入射波段在1485—1530nm区域时,波状结构2DPC的负折射角与入射波长近似呈线性变化关系,并带有明显的PC超棱镜效应,采用端面投影方法对波状结构2DPC的入射端面和出射端面进行处理,改善了负折射时的透过率.
The negative refraction inside the PC was analyzed by the equipotential surface structure of the two-dimensional (2D) photonic crystal (PC) and the incident medium. The time-domain finite difference (FDTD) method was used to simulate the Gaussian beam in the 2DPC The negative refraction angle of the corrugated structure 2DPC and the incidence angle of the incident wavelength and the angle of incidence / incident wavelength are respectively obtained. When the incident angle is 45 ° and the incident wavelength is in the region of 1485-1530 nm, Which shows a linear relationship with linearity. With the obvious PC super prism effect, the incident end and exit end of 2DPC with wavy structures are processed by the end projection method, which improves the transmittance in negative refraction.