Invention Grant
- Patent Title: Method for evaluating secondary optical system of electron beam inspection device
-
Application No.: US16891620Application Date: 2020-06-03
-
Publication No.: US11251017B2Publication Date: 2022-02-15
- Inventor: Takehide Hayashi
- Applicant: EBARA CORPORATION
- Applicant Address: JP Tokyo
- Assignee: EBARA CORPORATION
- Current Assignee: EBARA CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Pearne & Gordon LLP
- Priority: JPJP2019-116821 20190625
- Main IPC: H01J37/28
- IPC: H01J37/28 ; H01J37/244 ; G01N23/225

Abstract:
A method for evaluating a secondary optical system of an electron beam inspection device provided with a primary optical system that irradiates a sample placed at an observation target position with an electron beam emitted from an electron source, and the secondary optical system that forms, on a detector, an enlarged image of an electron beam generated from the sample or an electron beam transmitted through the sample. The method includes: placing a photoelectric surface at the observation target position; irradiating the photoelectric surface with laser; forming an enlarged image of an electron beam generated from the photoelectric surface on the detector by the secondary optical system; and evaluating the secondary optical system based on an electron beam image obtained by the detector.
Information query