Patent ID: 7928379
Filing Date: 2011-04-19
Classification: H01J

Abstract:
1. A phase plate for electron optical imaging, wherein an electron beam is divided by an object into a zero beam and diffracted electron beams, the phase plate being designed as an electrode that extends into an area of the zero beam for phase-shifting the zero beam using an electric field generated by a voltage in order to obtain a high-contrast image through interference with the diffracted electron beams, the electrode comprising: a mounting; a conductor disposed to extend in a substantially radial direction from said mounting to the area of the zero beam; and a shielding disposed proximate to and surrounding said conductor and extending from said mounting to the area of the zero beam, wherein said conductor and said shielding have an end proximate the zero beam from which the electric field is formed to extend between said conductor and said shielding while overlapping the zero beam.