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Microfabricated high-bandpass foucault aperture for electron microscopy

United States Patent

August 26, 2014
View the Complete Patent at the US Patent & Trademark Office
A variant of the Foucault (knife-edge) aperture is disclosed that is designed to provide single-sideband (SSB) contrast at low spatial frequencies but retain conventional double-sideband (DSB) contrast at high spatial frequencies in transmission electron microscopy. The aperture includes a plate with an inner open area, a support extending from the plate at an edge of the open area, a half-circle feature mounted on the support and located at the center of the aperture open area. The radius of the half-circle portion of reciprocal space that is blocked by the aperture can be varied to suit the needs of electron microscopy investigation. The aperture is fabricated from conductive material which is preferably non-oxidizing, such as gold, for example.
Glaeser; Robert (Berkeley, CA), Cambie; Rossana (Moraga, CA), Jin; Jian (Berkeley, CA)
The Regents of the University of California (Oakland, CA)
13/ 708,521
December 7, 2012
STATEMENT OF GOVERNMENT SUPPORT This invention was made with government support under Contract No. DE-A02-05CH11231 awarded by the U.S. Department of Energy and under National Institutes of Health Grant GM 083039. The government has certain rights in this invention.