准随机点阵二值化Gabor波带片聚焦特性的数值计算

Numerical calculation of focusing properties of quasi-random-dot-array binary Gabor zone plate

Fresnel波带片有多个焦点,作为单色器波长选择元件使用时会受到高级衍射的影响。而Gabor波带片只有一个焦点,有更好的聚焦特性,但制作难度较大,准随机点阵二值化Gabor波带片概念的提出则解决了这个问题。介绍了准随机点阵二值化Gabor波带片的设计,并利用优化的程序分别对Fresnel波带片和准随机点阵二值化Gabor波带片的聚焦特性进行了模拟计算,通过对计算结果进行分析比较,发现准随机点阵二值化Gabor波带片具有抑制高阶衍射的特性。

Fresnel zone plate has a dominating focus and a series of high-order foci,it will be influenced by advanced diffraction when used as an imaging device.A Gabor zone plate has only one focus,it has much better diffraction properties.However,it is hard to fabricate.The emergence of quasi-random-dot-array binary Gabor zone plates can solve this problem.In this paper,design of quasi-random-dot-array binary Gabor zone plates is introduced,and diffraction properties of Fresnel zone plate and binary Gabor zone plate are simulated by optimized program.Analyzing and comparing the simulation show that the quasi-random-dot-array binary Gabor zone plate could restrain advanced diffraction.