Performance modification of square zone plate by a given distribution of pinholes or anti-pinholes over dark zones

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• 作者：Arash Sabatyan ; ^{a.sabatyan@urmia.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; Ali Hamzezadeh Afkham
• 关键词：Fresnel diffraction ; Diffractive lens ; Fresnel zone plate ; Square zone plate
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：127
• 期：20
• 页码：9942-9946
• 全文大小：1456 K

文摘

We introduce two models of dark zone – based square photon sieve – in which a desired distribution of light pinholes are inserted into dark zones in the former model, whereas black zones are replaced by black pinholes in the last ones. It is shown that the location and size of the pinholes has an operative effect in increasing diffractive and imaging efficiency of square zone plate. We show that background intensity is well modified therefore visibility is noticeably enhanced. Moreover, the resolution is increased by reduction the width of the central maximum. In addition, secondary maxima are also well suppressed. As a result, focusing and imaging feature of square zone plate are significantly modified.