COMPUTER-ANALYSIS OF SIDE-BAND HOLOGRAPHY IN STEM

The feasibility of a recently proposed method for direct reconstruction of a wave function at the exit plane of an object is tested on the basis of computer simulation. It is assumed that the point electron source of a STEM instrument is ideally coherent. Optimum imaging conditions for recording of a hologram are found with respect to a restoration error as a function of the desired spatial resolution of a restored wave function and the accelerating voltage. The highest spatial resolution that can be achieved for 100 and 300 kV holography is determined. The size of a region is determined for which the wave function can be restored for any one beam position. Accuracy requirements to which the experimental imaging conditions should be known are worked out.