The In situ Interferometry Transmission Electron Microscope (I2TEM), is a microscope designed to easily performed new electron interferometry experiment [1,2,3]. The microscope is equipped with a 300kV cold field emission source, one electrostatic Möllenstedt biprism (BP) installed before the three condenser lenses, two goniometer stages situated respectively above and inside the objective lens pole piece (namely high resolution stage and Lorentz stage) and finally three BPs placed between the intermediate lenses. The strength of this microscope lies in its wide optical flexibility, which can be used to develop new configurations very difficult to obtain using standard TEM. On the other hand, this flexibility increases the optical complexity of the operation and implies being able to simulate the electrons trajectories as a function of the various optical conditions (lenses excitations, High voltage, gun lens ratio, …) to predict “a priori” the hologram properties which will be obtained (width, interference fringes, …).
To perform such simulations, all lenses strengths have been calculated using finite element modelling software COMSOL multiphysics (see figure 1) , as a function of their ampere-turns excitations. These results are then used in SIMION software (see figure 2)  to compute the complete electron trajectories starting from the FE tip through the biprism to finish in the detector plane.
The simulations are finally compared to experimental data in order to calibrate the model.
 T Denneulin et al, Ultramicroscopy 160 (2016), 98–109.
 F Röder et al, Ultramicroscopy 161 (2016), 23–40.
 F Houdellier et al, Ultramicroscopy 159, Part 1 (2015), 59–66.
To cite this abstract:Yudai Kubo, Christophe Gatel, Yoshifumi Taniguchi, Etienne Snoeck, Florent Houdellier; Developing new electron interferometry configurations in I2TEM thanks to electron optics simulations. The 16th European Microscopy Congress, Lyon, France. https://emc-proceedings.com/abstract/developing-new-electron-interferometry-configurations-in-i2tem-thanks-to-electron-optics-simulations/. Accessed: December 6, 2019
EMC Abstracts - https://emc-proceedings.com/abstract/developing-new-electron-interferometry-configurations-in-i2tem-thanks-to-electron-optics-simulations/