近场条件下的扫描成象方程  

EQUATIONS FOR SCANNING IMAGING IN NEAR FIELD

作　　者：李志扬[1,2,3] 潘小春[1,2,3] 刘武[1,2,3] 李兴教 

机构地区：[1]华中师范大学物理系 [2]湖北教育学院物理系 [3]华中理工大学固体电子系

出　　处：《光子学报》1998年第10期919-922,共4页Acta Photonica Sinica

基　　金：国家自然科学基金

摘　　要：本文考察了传统（远场）扫描成象方程，发现它们在近场条件下不成立．通过引入一个探测效率因子，我们建立了对近场条件与远场条件都成立的统一的扫描成象方程．同时我们还分别采用标量Ｋｉｒｃｈｈｏｆ模型和矢量Ｂｅｔｈｅ－Ｂｏｕｗｋａｍｐ模型对探测效率因子进行了计算，计算结果表明它们都与探针孔径成正比，但后者的分布要比前者宽约６倍．The paper reexamined the traditional equations for scanning imaging in far field and found that it is inapplicable in near field.By the introduction of a collection coefficient equations for both far and near field have been set up.The collection coefficient has been calculated using scalar Kirchhoff model and vector Bethe Bouwkamp model respectively.It was found that the collection coefficient is proportional to the aperture diameter and it has a distribution about six times wider in Bethe Bouwkamp model than in Kirchhoff model.

关 键 词：扫描成象 近场 探测效率因子 光学显微镜 

分 类 号：TH742.01[机械工程—光学工程]