Abstract:
PROBLEM TO BE SOLVED: To provide a mass filter for focus ion beam device which selects a desired ion species from a plurality of ion sources with no color aberration.SOLUTION: Multiple ions 110 generated from an ion source 114 pass through an upper lens 106 to form a substantially parallel beam 310 which impinges on a mass filter 304. The mass filter 304 consists of an upper EXB filter 306U and a lower EXB filter 306L having central axes offset from each other, and the beam 310 is separated and deflected for each mass before exiting as a trajectory parallel with the optical axis 380. Color aberration generated from the upper EXB filter 306U is canceled by the lower EXB filter 306L. Thereafter, only the desired ions 332 are passed by a mass separation aperture 342, and focused on a substrate 112 by means of a lower lens 108.
Abstract:
PROBLEM TO BE SOLVED: To provide a charged particle filter with an integrated energy filter.SOLUTION: Where most filters used have a highly curved optical axis and thus use parts with forms that are difficult to manufacture, a charged particle source according to the invention uses electrodes surrounding a straight optical axis. Surprisingly the inventor found that it is well possible to deflect a beam of charged particles 106a quite far from an optical axis 104 showing respectable energy dispersion at an energy selecting slit 108 without introducing coma or astigmatism that cannot be corrected, provided that some of the electrodes (114, 116, 120, 122) are formed as 120°/60°/120°/60°. Such electrodes can be attached to each other by gluing or brazing of ceramic. A series of highly concentric bores can be formed by e.g. spark erosion.
Abstract:
PROBLEM TO BE SOLVED: To provide a dark field detection system of a scanning electron microscope (SEM) having a polar angle identification function of scattered electrons. SOLUTION: This is to disclose a position embodiment relating to an electron beam scanning device which includes an objective lens, a scanning deflector, an anti-scanning deflector, an energy-filter drift tube, and a detector split in region. For the objective lens, an immersion lens having a high abstraction field is used, and identification of azimuth of the electrons scattered on the surface of the sample is made possible. The anti-scanning deflector is used for correction of scanning of the incident electron beams. The energy-filter drift tube is constructed so as to match the scattered electrons according to the polar angle of the orbit from the surface of the sample. COPYRIGHT: (C)2006,JPO&NCIPI