1. Thin Film Physics Division; Department of Physics; Chemistry and Biology (IFM); Linköping University; SE-581 83 Linköping Sweden
2. Center for Electron Nanoscopy; Technical University of Denmark (DTU), Danchip/CEN; DK-2800 Kgs. Lyngby Denmark
3. Terahertz Materials Analysis Center (THeMAC); Department of Physics, Chemistry and Biology (IFM); Linköping University; SE-581 83 Linköping Sweden