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Published June 12, 2000 | public
Journal Article Open

Low-energy electron beam focusing in self-organized porous alumina vacuum windows


Micromachined, micron-thick porous alumina membranes with closed pore endings show high electron transparency above an energy of 5 keV. This is due to the channeling of electrons along the negatively charged insulating pores after surmounting the thin entrance layer. We also find a sharp hightransparency energy window at energies as low as 2 keV which may be the result of a local maximum of channeling, as predicted by simulations, and positive charge up of the entrance layer causing electron electrostatic focusing. Applications for these membranes range from atmospheric electron spectroscopy to self-assembled, nanoscale, large-area electron collimators.

Additional Information

©2000 American Institute of Physics. (Received 14 February 2000; accepted 20 April 2000) This research was funded by the German Humboldt Foundation, Caltech SURF and JPL DRDF program and also supported by the U.S. AFOSR, Contract No. AFS-5XF49620-1-044.-SC.


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