Quantitative Electron Holographic Analysis of Electric Potential Distribution around FEG-Emitters

Abstract

By means of electron holography, the electric potential distributions around a cold-type FEG-emitter (field emission gun emitter) are visualized with a change in the applied voltages. In a biased FEG-emitter, the experimental method for obtaining an unperturbed reference wave is applied in order to carry out quantitative electron holographic analyses. Further, through comparing the experimental results obtained by electron holography with those of the simulations taking into account the three dimensional configurations of the FEG-emitter and the anode, it is found that the experimental technique presented in this study is quite useful in obtaining the quantitative information regarding the electric field distribution around a biased FEG-emitter.