Coherent Imaging with Low-Energy Electrons (30 – 250 eV)

Speaker: 

Dr. Tatiana Latychevskaia
Physics Institute, University of Zurich

Abstract:

Low-energy electron (30 –250 eV) in-line holography (also known as or point-projection imaging) is realized by placing a sample at a few tens of nanometers in front of an electron source (usually a sharp tungsten tip) where electrons are extracted by field emission [1], Fig. 1(a). When electron wave passes through the sample, part of the wave is scattered. The interference between the scattered and unperturbed waves creates an in-line hologram which is acquired by the detector, positioned at a few centimetres from the electron source. Three subjects will be discussed: biological imaging, imaging of charged impurities in graphene with elementary charge precision and imaging three-dimensional surface corrugation of graphene.
 

Bio: 

Dr. Tatiana Latychevskaia, Privatdozent at the University of Zurich, earned her Diploma in Physics at the Technical University of St-Petersburg (Russia) and her PhD in Physical Chemsitry at the ETH Zurich (Switzerland). Since 2002 she has been postoctoral research at the University of Basel and then at the University of Zurich, with a short stay in 2003 at Academia Sinica in Taiwan. Dr Latychevskaia’s expertise is in coherent imaging with light, X-ray, electron and terahertz waves. Her research resulted in about 60 articles and book chapters. In 2010 Dr Latychevskaia was awarded an individual grant “Structure of Individual Bio-Molecules by Numerical Reconstruction of Coherent Diffraction Images” from the Forschungskredit of the University of Zurich.

Host:   Tsumoru Shintake, Quantum Wave Microscopy Unit

Contact:  Ayumi Shimojima, Shintake Unit (ayumi.shimojima@oist.jp)