本文从分析全内反射中的近场倏逝：坡出发，提出了在近场倏逝波衰减长度内置一金属Ag光栅的LED结构模型，同时基于时域有限差分（FDTD）方法计算了此模型的光谱特性，分析了此LED模型的光提取效率。结果表明置入的金属Ag光栅在特定的波段可以将近场倏逝波耦合为传播波模式辐射出去，从而有效地增强了LED的光提取效率。
Based on the analysis of near-field evanescent wave in the total internal reflection, a LED model was proposed by placing an Ag grating in the attenuated length of the evanescent wave. The spectral properties of the model were calculated by using the finite difference time domain （FDTD） method. The light extraction efficiency of the model was obtained. The results show that the embedded Ag grating can couple the near-field evanescent wave to the propagation wave that can emit out of the LED chip, which lead to the enhancement of the light extraction efficiency of LED.
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