The vectorial non-paraxial behavior should be taken into consideration and the longitudinal component can not be neglected once the aperture size is comparable with or less than the wavelength.
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美
释义
当光阑孔径与波长相当或小于波长时,衍射场的纵向分量不能忽略,必须考虑光场的矢量非傍轴特性。
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