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Bright sources under the projection microscope: using an insulating crystal on a conductor as electron source

Abstract : The development of bright sources is allowing technological breakthroughs, especially in the field of microscopy. This requires a very advanced control and understanding of the emission mechanisms. For bright electron sources, a projection microscope with a field emission tip provides an interference image that corresponds to a holographic recording. Image reconstruction can be performed digitally to form a "real" image of the object. However, interference images can only be obtained with a bright source that is small: often, an ultra-thin tip of tungsten whose radius of curvature is of the order of 10nm. The contrast and ultimate resolution of this image-projecting microscope depend only on the size of the apparent source. Thus, a projection microscope can be used to characterize source brightness: for example, analyzing the interference contrast enables the size of the source to be estimated. Ultra-thin W tips are not the only way to obtain bright sources: field emission can also be achieved by applying voltages leading to a weak macroscopic electric field (< 1V /µm) to insulating micron crystals deposited on conductors with a large radius of curvature (> 10µm). Moreover, analyzing the holograms reveals the source size, and the brightness of these new emitters equals that of traditional field emission sources.
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Preprints, Working Papers, ...
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https://hal-amu.archives-ouvertes.fr/hal-03447783
Contributor : Evelyne Salançon Connect in order to contact the contributor
Submitted on : Wednesday, November 24, 2021 - 7:14:22 PM
Last modification on : Tuesday, January 4, 2022 - 6:37:26 AM

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  • HAL Id : hal-03447783, version 1

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L Lapena, D Bedrane, A Degiovanni, E. Salançon. Bright sources under the projection microscope: using an insulating crystal on a conductor as electron source. 2021. ⟨hal-03447783⟩

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