Details

Autor(en) / Beteiligte

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

Titel

Phase retrieval of an electron vortex beam using diffraction holography

Ist Teil von

• Applied physics letters, 2017-11, Vol.111 (22)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2017

Quelle

AIP Scitation Journals Complete

Beschreibungen/Notizen

• 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 wide range of samples.