讨论了入射角、入射方位角、入射光波长、光栅栅距、介质折射率与矩形光栅衍射级次数目间的关系。
The relationships between the number of diffraction order and grating pitch, refractive index of medium, light wavelength, incidence Angle and azimuth Angle are investigated.
对于介质目标微波衍射成象，本文引入了WKB近似来模拟目标内部总场。
For microwave diffraction imaging, we use the WKB approximation to estimate the total field in the dielectric object.
当介质的吸收不可忽略时，对于耦合较强的光栅，参考光尺寸的增大反而会引起衍射效率的下降。
However, for strongly-coupled gratings if the absorption of medium cannot be ignored, the diffraction efficiency decreases with widening of reference beam.
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