Focusing specification of cross-like Fresnel zone plate

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• 作者：Arash Sabatyan ; ^{a.sabatyan@urmia.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; Jila Rafighdoost
• 关键词：Fresnel diffraction ; Diffractive optics ; Fresnel zone plate ; Square zone plate
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：126
• 期：24
• 页码：4796-4799
• 全文大小：1212 K

文摘

Focusing characteristics of cross like Fresnel zone plate is well analyzed. This element is composed of two perpendicular linear Fresnel zone plates. Focusing properties of the element is compared to a classic and square Fresnel zone plate. Analysis clarify that focusing of the elements is well corrected in comparison to square Fresnel zone plate. Resolution is noticeably increased, DC noise and diffraction efficiency are substantially reduced and also secondary maxima have been evidently suppressed. Theoretical results have been completely verified by experiment.