Patent ID: 9105444
Filing Date: 2015-08-11
Classification: H01J

Abstract:
1. An electro-optical inspection apparatus for inspecting a surface of a sample using an electron beam, the electro-optical inspection apparatus comprising: an electron beam source; a primary electro-optical system comprising at least a primary lens for inducing a primary electron beam emitted from the electron beam source; a stage for mounting the sample thereon, the surface of the sample being irradiated with the primary electron beam induced through the primary electro-optical system; a secondary electro-optical system comprising at least a secondary lens and an aperture for defining a numerical aperture (NA), and for inducing secondary electrons and mirror electrons, the secondary electrons being emitted from the sample surface when irradiating the sample surface with the primary electron beam, and the mirror electrons being reflected from the sample surface and a vicinity thereof when irradiating the sample surface with the primary electron beam; a detector for detecting at least either of the secondary electrons or the mirror electrons induced through the secondary electro-optical system; a first power source for supplying a first voltage to the sample mounted on the stage; an energy control means for setting an energy of the primary electron beam directed to the sample surface and an energy supplied to the sample such that electrons directed from the sample surface to the detector are within a transition band which contains the mirror electrons and the secondary electrons; an aperture adjustment mechanism for adjusting a location of at least the aperture on a plane perpendicular to an axis of the secondary electro-optical system, so that electrons from a conductive material region of the sample surface and electrons from a nonconductive material region of the sample surface are selectively induced to the detector; a first electrode located to surround the sample mounted on the stage, the first electrode for collecting dust or particles; a second power source for supplying a second voltage to the first electrode, wherein the second voltage has a same polarity as that of the first voltage and an absolute value which is equal to or larger than that of the first voltage; a first terminal plate comprising at least two terminals, one of the at least two terminals being connected to the first power source and another of the at least two terminals being connected to the second power source; a cable including two electrical wires, first ends of the two electrical wires being connected to the at least two terminals of the first terminal plate, respectively; a box containing the first terminal plate therein, a portion of the cable, and a second electrode for collecting dust or particles in the box, the portion of the cable contained in the box being supported to be flexibly bendable; and a second terminal plate fixed at the stage and comprising at least two terminals connected to second ends of the two electrical wires, the at least two terminals of the second terminal plate to supply the first and second voltages to the sample and the first electrode, wherein a portion of the cable between the box and the second terminal plate is supported to extend linearly, and the portion of the cable contained in the box bends or extends as the stage is moved.