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Type: 
Journal
Description: 
In both light optics and electron optics, the amplitude of a wave scattered by an object is an observable that is usually recorded in the form of an intensity distribution in a real space image or a diffraction image. In contrast, retrieval of the phase of a scattered wave is a well-known challenge, which is usually approached by interferometric or numerical methods. In electron microscopy, as a result of constraints in the lens setup, it is particularly difficult to retrieve the phase of a diffraction image. Here, we use a “defocused beam” generated by a nanofabricated hologram to form a reference wave that can be interfered with a diffracted beam. This setup provides an extended interference region with the sample wavefunction in the Fraunhofer plane. As a case study, we retrieve the phase of an electron vortex beam. Beyond this specific example, the approach can be used to retrieve the wavefronts of diffracted beams from a …
Publisher: 
Publication date: 
24 Mar 2017
Authors: 

Federico Venturi, Marco Campanini, Gian Carlo Gazzadi, Roberto Balboni, Stefano Frabboni, Robert W Boyd, Rafal E Dunin-Borkowski, Ebrahim Karimi, Vincenzo Grillo

Biblio References: 
Origin: 
arXiv preprint arXiv:1703.08496