Laboratorium für Elektronenmikroskopie, Karlsruher Institut für Technologie, 76128 Karlsruhe, Germany.
Microsc Microanal. 2012 Oct;18(5):1010-5. doi: 10.1017/S1431927612001560. Epub 2012 Oct 12.
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.
Zach 相板 (PP) 是增强透射电子显微镜相位对比的有前途的器件。Zach PP 通过在物镜的后焦平面上的强局部非均匀静电势来改变零阶光束的相位。我们提出了对 Zach PP 的重大改进，克服了以前的限制。微结构加热装置的实现显著减少了 PP 结构的污染和电荷积累，并延长了其寿命。改进的生产工艺允许制造具有减小尺寸的 PP，这导致较低的截止频率，如静电势的模拟所揭示的。通过施加不同的电压，在带有 LaB6 阴极的标准透射电子显微镜中展示了具有 PbSe 纳米粒子反转的相位对比。
