双离轴衍射透镜的矢量设计算法

A vector algorithm for designing double off-axis diffractive lenses

设计特征尺寸可与照射光波长相比拟的衍射光学器件时 ,必须采用严格的矢量设计算法。为克服传统搜索算法计算次数多、收敛速度慢的缺点 ,同时结合时域有限差分算法进行光场与衍射器件相互作用的矢量计算 ,提出了一种高效的迭代算法。利用该算法 ,设计了双离轴透镜 ,结果表明 ,该算法计算次数少。

A vector algorithm for designing two dimensions,finite aperture,aperiodic diffractive optical elements based on rigorous electromagnetic computation model the finite-difference time-domain method has been proposed.All aspects relating to the algorithm such as optimization process,the finite-difference time-domain method,and the diffractive integral,have been discussed.The algorithm can present rigorous design results with reasonable computational cost and good designing results.Two double off-axis diffractive lenses for normally incident TE mode have been designed to illustrate the algorithm.The algorithm is useful for the improvement of vector algorithm for designing diffractive optical elements and the applications of diffractive optical elements.