% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Chang:827181,
      author       = {Chang, Shery and Jin, Lei and Barthel, Juri and
                      Dunin-Borkowski, Rafal and Dwyer, Christian},
      title        = {{L}ow dose electron holography using direct-electron
                      detection camera},
      address      = {Weinheim, Germany},
      publisher    = {Wiley-VCH Verlag GmbH $\&$ Co. KGaA},
      reportid     = {FZJ-2017-01379},
      pages        = {769 - 770},
      year         = {2016},
      comment      = {European Microscopy Congress 2016: Proceedings},
      booktitle     = {European Microscopy Congress 2016:
                       Proceedings},
      abstract     = {The advent of commercially-available direct detection
                      cameras (DDCs) for transmission electron microscopy (TEM)
                      offers the opportunity to reduce noise in images and
                      diffraction patterns as well as providing fast frame rates
                      for image recording. For sufficiently low dose rates, their
                      design can enable significant improvements in detective
                      quantum efficiency (DQE) and modulation transfer function
                      (MTF) when compared to conventional charge-coupled device
                      (CCD) cameras. Existing literature on DDCs is focused
                      predominantly on structural biological applications, where
                      they provide clear advantages under low dose conditions,
                      e.g., typically < 10 e−Å−2 . Whereas the
                      characteristics of DDCs at dose rates and spatial
                      resolutions that are applicable to biological materials are
                      already well established, in many other areas of TEM the
                      dose rate can exceed 1000 e−Å−2, while the spatial
                      resolution can vary from nanometers to better than 1 Å. In
                      these contexts, the benefit of DDCs is less clear.Here, we
                      examine this question in the context of high-resolution
                      phase contrast imaging and off-axis electron holography and
                      demonstrate that the improved MTF and DQE of a DDC result in
                      clear benefits over conventional CCD cameras. For electron
                      holography, we find a significant improvement in the
                      holographic interference fringe visibility and a reduction
                      in statistical error in the phase of the reconstructed
                      electron wavefunction. In addition, we show that at least
                      three-fold improvement in optimum phase resolution using the
                      counting mode provided by DDC with four time less dose rate
                      compared that of a conventional CCD camera (with a fringe
                      spacing of 83pm in this case). Further improvement in SNR
                      could be obtained by correlation and averaging over a series
                      of holograms. As a result of the low camera noise, the
                      correlation of individual hologram is robust even at low
                      dose rates, and the averaging leads to an improvement in SNR
                      that is close to the ideal root-N behavior (N being the
                      number of images).Using BiFeO3 on DyScO3 substrate as an
                      example, we demonstrate that both specimen and birpism
                      fringe drift can be successfully correlated over 100 frames
                      of hologram (total exposure of 20 sec at a dose rate of 10
                      e− per pixel per sec), as shown in Fig. 2. Our results
                      show that DDCs are highly beneficial for electron holography
                      (and similarly to high-resolution TEM ) at low dose rates,
                      thereby minimising potential specimen damage while
                      maintaining an adequate SNR for analysis.},
      month         = {Aug},
      date          = {2016-08-28},
      organization  = {16th European Microscopy Congress (EMC
                       2016), Lyon (France), 28 Aug 2016 - 2
                       Sep 2016},
      cin          = {PGI-5 / ER-C-1},
      cid          = {I:(DE-Juel1)PGI-5-20110106 / I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.1002/9783527808465.EMC2016.6971},
      url          = {https://juser.fz-juelich.de/record/827181},
}