Patent ID: 7423274
Filing Date: 2008-09-09
Classification: B82Y,H01J

Abstract:
1. An electron beam writing system, comprising: an electron source; an electron-optical system for irradiating an electron beam emitted from said electron source onto a sample via deflection means having at least two different deflection speeds and an objective lens so as to scan the sample, thereby forming a desired pattern on said sample; a stage on which said sample is mounted; a correction mark provided on said stage; an electron detector for detecting a reflected electron, a secondary electron, or a transmitted electron obtained by the irradiation of said electron beam; a function to move said electron beam through high-speed scanning by said deflection means so as to repeat formation of a patterned electron beam; a function to move said electron beam on said correction mark through low-speed scanning by said deflection means in synchronization with one cycle of said repetition; and a function to detect a reflected electron or a secondary electron emitted from said correction mark and the vicinity thereof or a transmitted electron transmitted through said correction mark by said low-speed scanning so as to correct a position, deflection amount, or blanking time of said electron beam based on said detection result, wherein said patterned electron beam is formed of a plurality of separate pattern beams, said correction mark is formed of a plurality of separate pattern marks, and a data storing unit for storing a signal waveform obtained by the deflection scanning of said patterned electron beam on said correction mark and a signal analysis unit for analyzing said signal waveform are provided, and wherein said patterned electron beam is a diffraction-grating-pattern beam in which the pattern beams are arranged at a constant interval, and said correction mark is a diffraction-grating-pattern mark in which the pattern marks are arranged at the same interval as that of said diffraction-grating-pattern beam.