Dresden 2011 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Topical Session TEM V
MM 17.1: Topical Talk
Tuesday, March 15, 2011, 14:00–14:30, IFW A
New Electrostatic Phase Plate for Phase-Contrast Transmission Electron Microscopy and Its Application for Wave-Function Reconstruction — Björn Gamm1, Katrin Schultheiss2,4, Joachim Zach3, Manuel Dries1, Nicole Frindt4, Rasmus R. Schröder4, and •Dagmar Gerthsen1 — 1Laboratorium für Elektronenmikroskopie, Karlsruher Institut für Technologie (KIT), 76131 Karlsruhe, Germany — 2InnovationLab, Speyerer Straße 4, 69115 Heidelberg, Germany — 3CEOS GmbH, Englerstr. 28, 69126 Heidelberg, Germany — 4Bioquant Cell Networks, Universität Heidelberg, 69120 Heidelberg, Germany
We present a promising new design of an electrostatic physical phase plate for transmission electron microscopy. The design consists of a microcoaxial cable with the exposed electrode positioned near the undiffracted beam in the back focal plane of the objective lens. The absence of an obstructing ring electrode around the central beam overcomes the major drawback of Boersch-type phase plates. The new phase plate was used to acquire phase-contrast images with different phase shifts of the undiffracted electrons. These images are used to reconstruct the complex image wave function. After correction for the objective-lens aberrations the object-wave function is obtained, which contains information as for example phase shifts due to the differences of the mean inner potential. The reconstruction algorithm is demonstrated for experimental images from platinum nanoparticles.