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Journal of Electron Microscopy Advance Access originally published online on August 2, 2005
Journal of Electron Microscopy 2005 54(3):191-197; doi:10.1093/jmicro/dfi024
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© The Author 2005. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Phase measurement of atomic resolution image using transport of intensity equation

Kazuo Ishizuka1,* and Brendan Allman2

1 HREM Research Inc., Matsukazedai, Saitama 355-0055, Japan and 2 IATIA Ltd., Box Hill Nth, Vic. 3129, Australia

* To whom correspondence should be addressed. E-mail: ishizuka@hremresearch.com

Since the Transport Intensity Equation (TIE) has been applied to electron microscopy only recently, there are controversial discussions in the literature regarding the theoretical concepts underlying the equation and the practical techniques to solve the equation. In this report we explored some of the issues regarding the TIE, especially bearing electron microscopy in mind, and clarified that: (i) the TIE for electrons exactly corresponds to the Schrödinger equation for high-energy electrons in free space, and thus the TIE does not assume weak scattering; (ii) the TIE can give phase information at any distance from the specimen, not limited to a new field; (iii) information transfer in the TIE for each spatial frequency g will be multiplied by g2 and thus low frequency components will be dumped more with respect to high frequency components; (vi) the intensity derivative with respect to the direction of wave propagation is well approximated by using a set of three symmetric images; and (v) a substantially larger defocus distance than expected before can be used for high-resolution electron microscopy. In the second part of this report we applied the TIE down to atomic resolution images to obtain phase information and verified the following points experimentally: (i) although low frequency components are attenuated in the TIE, all frequencies will be recovered satisfactorily except the very low frequencies; and (ii) using a reconstructed phase and the measured image intensity we can correct effectively the defects of imaging, such as spherical aberrations as well as partial coherence.

Keywords     transfer of intensity equation, HREM, phase measurement, quantitative phase imaging, aberration correction

Received     25 January 2005, accepted 8 March 2005


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 J Electron Microsc (Tokyo)Home page
M. Mitome, K. Ishizuka, and Y. Bando
Quantitativeness of phase measurement by transport of intensity equation
J. Electron Microsc. (Tokyo), September 19, 2009; (2009) dfp046v1.
[Abstract] [Full Text] [PDF]


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