Improving Fabrication and Application of Zach Phase Plates for Phase-Contrast Transmission Electron Microscopy
Improving Fabrication and Application of Zach Phase Plates for Phase-Contrast Transmission Electron Microscopy
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DOI：
10.1017/s1431927612001560
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发表时间：
2012-10-01
影响因子：
2.8
通讯作者：
Gerthsen, Dagmar
中科院分区：
文献类型：
--
作者：
Hettler, Simon;Gamm, Bjoern;Gerthsen, Dagmar
Zach位相板是一种很有前途的提高透射电子显微镜位相衬度的器件。Zach PP通过在物镜透镜的后焦平面中的强烈局部化的不均匀静电势来移动零级光束的相位。我们提出了实质性的改进Zach PP，克服了以前的局限性。微结构化加热装置的实施显著减少了PP结构的污染和充电，并延长了其寿命。改进的生产工艺允许制造具有减小的尺寸的PP，从而导致较低的截止频率，如通过静电势的模拟所揭示的。通过施加不同的电压，在具有LaB6阴极的标准透射电子显微镜中展示了PbSe纳米颗粒的反转的相衬。
Zach phase plates (PPs) are promising devices to enhance phase contrast in transmission electron microscopy. The Zach PP shifts the phase of the zero-order beam by a strongly localized inhomogeneous electrostatic potential in the back focal plane of the objective lens. We present substantial improvements of the Zach PP, which overcome previous limitations. The implementation of a microstructured heating device significantly reduces contamination and charging of the PP structure and extends its lifetime. An improved production process allows fabricating PPs with reduced dimensions resulting in lower cut-on frequencies as revealed by simulations of the electrostatic potential. Phase contrast with inversion of PbSe nanoparticles is demonstrated in a standard transmission electron microscope with LaB6 cathode by applying different voltages.