Project: Electron Holography

Contact: E. Salançon

This new type of projection microscope consists of a celadonite-based electron source, which has a very high brightness but requires operation at a distance from the structure. To compensate for the loss of magnification, an electrostatic lens and a high resolution screen are used. This holographic microscope makes it possible to achieve magnifications equivalent to those obtained in conventional projectors (about x10^6) in the same acquisition time, while working at a microscopic distance between the source and the sample. This allows for a more comfortable working environment and lower loading effects on the object.

Salançon, A. Degiovanni, L. Lapena and R. Morin, “A low-energy electron point-source projection microscope not using a sharp metal tip performs well in long-range imaging”, Ultramicroscopy 200, May 2019, 125-131

Projection electron holography

This film gives a detailed presentation of low energy projection holographic electron microscopy.

Produced as part of the “un chercheur, une manip” (palais de la découverte) event on holography in January 2011, this film shows images recorded in real time; what can be seen or manipulated with the projection microscope: effects of magnification, of the electrical polarisation of an object, or of the magnetic field it creates. The film also shows how to obtain an off-axis hologram and how to reconstruct an electron hologram.