Fresnel zone plate with apodized aperture for hard X-ray Gaussian beam optics

Fresnel zone plates with apodized apertures [apodization FZPs (A-FZPs)] have been developed to realise Gaussian beam optics in the hard X-ray region. The designed zone depth of A-FZPs gradually decreases from the center to peripheral regions. Such a zone structure forms a Gaussian-like smooth-shouldered aperture function which optically behaves as an apodization filter and produces a Gaussian-like focusing spot profile. Optical properties of two types of A-FZP, i.e. a circular type and a one-dimensional type, have been evaluated by using a microbeam knife-edge scan test, and have been carefully compared with those of normal FZP optics. Advantages of using A-FZPs are introduced.

Source: Journal of Synchrotron Radiation - April 3, 2017 Category: Physics Authors: Takeuchi, A. Uesugi, K. Suzuki, Y. Itabashi, S. Oda, M. Tags: Fresnel zone plate X-ray microscopy apodization Gaussian beam optics research papers Source Type: research