摘要
The generalized Born approximation is an approximation method that represents the scattering term by the error between the exact Green's function and the approximate Green's function,mainly for the gradient scattering problem.However,so far,the research on the generalized Born approximation has only stayed in theory,and its implementation techniques are rarely reported.In order to fill this gap,the basic theory of generalized Born approximation is reviewed,and the implementation method of generalized Born approximation is discussed in this paper.In particular,the problem of calculating boundary effect elimination is discussed in detail.Finally,through model trial calculation,the calculation of gradient scattering,by comparing Born approximation and finite difference method,shows that using the generalized Born approximation to calculate gradient scattering achieves higher computational accuracy.
The generalized Born approximation is an approximation method that represents the scattering term by the error between the exact Green’s function and the approximate Green’s function, mainly for the gradient scattering problem. However, so far, the research on the generalized Born approximation has only stayed in theory, and its implementation techniques are rarely reported. In order to fill this gap, the basic theory of generalized Born approximation is reviewed, and the implementation method of generalized Born approximation is discussed in this paper. In particular, the problem of calculating boundary effect elimination is discussed in detail. Finally, through model trial calculation, the calculation of gradient scattering, by comparing Born approximation and finite difference method, shows that using the generalized Born approximation to calculate gradient scattering achieves higher computational accuracy.
基金
Supported by Project of the National Natural Science Foundation of China(No.41974135)
