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Center for High Energy Physics

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The Institute of Theoretical Science

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Oregon Center for Optical, Molecular and Quantum Science 

Special Seminar:

Tuesday, August 14, 2018
3:00 pm

472 Willamette (Institute of Theoretical Science conference room)

Host: Benjamin McMorran

Laura Clark
Dept. of Physics and Astronomy
Monash University, Australia.

“Remodelling electron optics for a modern imaging era

From their first demonstration, prior to WW2, the optical components in a transmission electron microscope have undergone huge developments over the last century, enabling imaging and diffraction at ever-higher resolution – particularly impacted by the successful implementation of aberration correctors over the last 10-15 years. Atomic resolution imaging of some types of specimen in vacuum is now routinely possible, while high-resolution in-situ imaging is heading in that direction.
High-resolution imaging of other categories of material remains challenging: contrast due to the subtle magnetic or longer-range electric fields in a sample is many orders of magnitude lower than the contrast due to the more-strongly scattering nuclei, and so is typically overwhelmed by noise. Many biological, or otherwise soft-matter specimens present the dual challenge of imparting only a small phase shift on the beam, while being easily damaged by a high-electron dose, limiting the resultant resolution.
In this presentation, I will discuss recent developments towards overcoming these challenges through introducing specific aberrations in the beam-forming optics (including creating electron vortex beams) in order to increase the recorded image contrast at a given electron dose, and the use of novel detector geometries to enable reliable measurements of specimen properties with improved resolution and accuracy.

 


Materials Science Institute 

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