提出并优化了由单排渐变介质波导构成的二维空气孔型光子晶体负折射平板透镜表面的减反层，改善了成像质量。
We propose and optimize the antireflection coating composed of a row of tapered dielectric waveguides for two-dimensional air hole-type photonic crystal negative refraction slab lens.
目前渐变折射率透镜的应用，通常都采用其主轴就是光线传播的光轴（横向应用）的形式，未见主轴垂直光轴应用的纵向应用分析说明。
The application of GRIN rod lens is usually used with its core as optical axis, this is transverse application, and any analyze for vertical application is not seen.
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