Electron holography used to realize Young's double-hole experiment together with the mapping of magnetic fields

This paper is intended to give an overview of the working principle of electron holography. Taking advantage of the potential of this technique, Young's well-known double-hole experiment with electrons has been realized with an original approach. Moreover, the Fresnel diffraction through a circular aperture which reveals the existence of the Fresnel zones for electrons is demonstrated. An important application of electron holography for the investigation of microscopic magnetic fields is also described. Pictorial maps are shown, which represent the magnetic field distribution in matter