Patent ID: 8921782
Filing Date: 2014-12-30
Classification: H01J

Abstract:
1. A tilt-imaging scanning electron microscope apparatus, the apparatus comprising: an electron gun for generating an electron beam along an optical axis of an electron beam column, wherein the electron beam includes a source-energy dispersion; a first deflector for deflecting the electron beam away from the optical axis; a second deflector for deflecting the electron beam back towards the optical axis, wherein the second deflector is configured such that a crossover of slow and fast electrons in the electron beam is formed at a position off the optical axis between the second deflector and the objective lens; an objective electron lens configured to image the crossover onto a spot displaced from the optical axis on a surface of a target substrate so as to generate secondary electrons, wherein the electron beam lands on the surface at a tilt angle; and a detector for detecting the secondary electrons.