Sub-100 nanosecond temporally resolved imaging with the Medipix3 direct electron detector

Paterson, G. W. , Lamb, R. J., Ballabriga, R., Maneuski, D. , O'Shea, V. and McGrouther, D. (2020) Sub-100 nanosecond temporally resolved imaging with the Medipix3 direct electron detector. Ultramicroscopy, 210, 112917. (doi: 10.1016/j.ultramic.2019.112917)

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Detector developments are currently enabling new capabilities in the field of Transmission Electron Microscopy (TEM). We have investigated the limits of a hybrid pixel detector, Medipix3, to record dynamic, time varying, electron signals. Operating with an energy of 60keV, we have utilised electrostatic deflection to oscillate electron beam position on the detector. Adopting a pump-probe imaging strategy we have demonstrated that temporal resolutions three orders of magnitude smaller than available for typically used TEM imaging detectors are possible. Our experiments have shown that energy deposition of the primary electrons in the hybrid pixel detector limits overall temporal resolution. Through adjustment of user specifiable thresholds or the use of charge summing mode, we have obtained images composed from summing 10,000s frames containing single electron events to achieve temporal resolution less than 100ns. We propose that this capability can be directly applied to studying repeatable material dynamic processes but also to implement low-dose imaging schemes in scanning transmission electron microscopy.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McGrouther, Dr Damien and O'Shea, Professor Val and Lamb, Mr Raymond and Maneuski, Dr Dima and Paterson, Dr Gary
Authors: Paterson, G. W., Lamb, R. J., Ballabriga, R., Maneuski, D., O'Shea, V., and McGrouther, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Ultramicroscopy
ISSN (Online):1879-2723
Published Online:07 December 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in 210:112917
Publisher Policy:Reproduced under a Creative Commons license
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
171131Fast Pixel Detectors: a paradigm shift in STEM imagingIan MacLarenEngineering and Physical Sciences Research Council (EPSRC)EP/M009963/1P&S - Physics & Astronomy
190883Consortium for advanced materials based on spin chiralityStephen McVitieEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1P&S - Physics & Astronomy