Aberration measuring apparatus for charged particle beam optical system, charged particle beam lithography machine having the aberration measuring apparatus, and device fabrication method using the apparatus

摘要

In order to measure an aberration of a charged particle beam optical system, an aberration measuring machine includes a charged particle generating unit adapted to make a plurality of charged particle beams strike the object plane of the charged particle beam optical system at different incident angles, and a detecting unit adapted to detect a position where the plurality of charged particle beams form images on the image surface of the charged particle beam optical system. The charged particle generating unit includes electron optical systems corresponding to the charged particle beams and an aperture stop to make the charged particle beams corresponding to pupil positions of the electron optical systems incident on the object plane at different incident angles.