Abstract:
The present invention relates to e.g. a charged particle beam energy width reduction system for a charged particle beam with a z-axis along the optical axis and a first and a second plane, comprising, a first element (110) acting in a focusing and dispersive manner, a second element (112) acting in a focusing and dispersive manner, a first quadrupole element (410) being positioned such that, in operation, a field of the first quadrupole element overlaps with a field of the first element acting in a focusing and dispersive manner, a second quadrupole element (412) being positioned such that, in operation, a field of the second quadrupole element overlaps with a field of the second element acting in a focusing and dispersive manner, a first charged particle selection element (618) being positioned, in beam direction, before the first element acting in a focusing and dispersive manner, and a second charged particle selection element (616;716) being positioned, in beam direction, after the first element acting in a focusing and dispersive manner. Thereby, a virtually dispersive source-like location without an inherent dispersion limitation can be realized.
Abstract:
A particle beam apparatus for tilted observation of a specimen is capable of producing magnification images of the specimen under tilted observation with high accuracy. The particle beam apparatus includes a source for generating a particle beam, deflection means for tilting the particle beam and a lens for focussing the tilted particle beam onto the specimen. Furthermore, multipole correction means are provided for correcting the lens aberrations occurring due to off-axial intersection of the lens by the tilted particle beam. The lens is an electrostatic, magnetic or combined electrostatic-magnetic objective lens.
Abstract:
An electron beam lens has a magnetic lens provided with first and second pole pieces for influencing an electron beam and forming a magnetic field between the two pole pieces. A third pole piece is provided, but is not in magnetic contact with the two other pole pieces. The third pole piece is immersed in the magnetic field formed between the first and second pole pieces and extracts a part of such magnetic field. Also disclosed is a cathode lens and an electron beam device for use with such an electron beam lens.
Abstract:
An image forming alpha filter having pole pieces with straight edges is disclosed which has good local resolution and very good energy resolution. It includes three deflection regions, which are separated from one another by relatively large interspaces.
Abstract:
A secondary charged particle detection device for detection of a signal beam is described. The device includes a detector arrangement having at least two detection elements with active detection areas, wherein the active detection areas are separated by a gap (G), a particle optics configured for separating the signal beam into a first portion of the signal beam and into at least one second portion of the signal beam, and configured for focusing the first portion of the signal beam and the at least one second portion of the signal beam. The particle optics includes an aperture plate and at least a first inner aperture openings in the aperture plate, and at least one second radially outer aperture opening in the aperture plate, wherein the first aperture opening has a concave shaped portion, particularly wherein the first aperture opening has a pincushion shape.
Abstract:
A method of compensating mechanical, magnetic and/or electrostatic inaccuracies in a scanning charged particle beam device is described. The method includes an alignment procedure, wherein the following steps are conducted: compensating 4-fold astigmatism with an element having at least 8-pole compensation capability, wherein the aligning and compensating steps of the alignment procedure act on a charged particle beam with beam dimensions in two orthogonal directions each of at least 50 μm and coaxially aligned with at least the element having at least the 8-pole compensation capability.
Abstract:
A secondary charged particle detection device for detection of a signal beam is described. The device includes a detector arrangement having at least two detection elements with active detection areas, wherein the active detection areas are separated by a gap (G), a particle optics configured for separating the signal beam into a first portion of the signal beam and into at least one second portion of the signal beam, and configured for focusing the first portion of the signal beam and the at least one second portion of the signal beam. The particle optics includes an aperture plate and at least a first inner aperture openings in the aperture plate, and at least one second radially outer aperture opening in the aperture plate, wherein the aperture plate is configured to be biased to one potential surrounding the first inner aperture opening and the at least one outer aperture opening.
Abstract:
An achromatic beam separator device for separating a primary charged particle beam from another charged particle beam and providing the primary charged particle beam on an optical axis (142) is provided, including a primary charged particle beam inlet (134), a primary charged particle beam outlet (132) encompassing the optical axis, a magnetic deflection element (163) adapted to generate a magnetic field, and an electrostatic deflection element (165) adapted to generate an electric field overlapping the magnetic field, wherein at least one element chosen from the electrostatic deflection element and the magnetic deflection element is positioned and/or positionable to compensate an octopole influence.
Abstract:
An electron beam device comprises: a beam emitter for emitting a primary electron beam; an objective electron lens for focusing the primary electron beam onto a specimen, the objective lens defining an optical axis; a beam separator having a first dispersion for separating a signal electron beam from the primary electron beam; and a dispersion compensation element. The dispersion compensation element has a second dispersion, the dispersion compensation element being adapted for adjusting the second dispersion independently of an inclination angle of the primary beam downstream of the dispersion compensation element, such that the second dispersion substantially compensates the first dispersion. The dispersion compensation element is arranged upstream, along the primary electron beam, of the beam separator.
Abstract:
The present invention relates to e.g. a charged particle beam energy width reduction system for a charged particle beam with a z-axis along the optical axis and a first and a second plane, comprising, a first element acting in a focusing and dispersive manner, a second element acting in a focusing and dispersive manner, a first quadrupole element being positioned such that, in operation, a field of the first quadrupole element overlaps with a field of the first element acting in a focusing and dispersive manner, a second quadrupole element being positioned such that, in operation, a field of the second quadrupole element overlaps with a field of the second element acting in a focusing and dispersive manner, a first charged particle selection element being positioned, in beam direction, before the first element acting in a focusing and dispersive manner, and a second charged particle selection element being positioned, in beam direction, after the first element acting in a focusing and dispersive manner. Thereby, a virtually dispersive source-like location without an inherent dispersion limitation can be realized.