Abstract:
A deflection system is presented for use in a lens arrangement of a charged particle beam column for inspecting a sample. The system comprises a magnetic deflector operable to create a magnetic field, and a pole piece assembly at least partly accommodated within the magnetic field. The pole piece assembly has a portion made of a soft magnetic material and is formed with an opening for a charged particle beam propagation therethrough. The deflection system allows for conducting the magnetic field created by the magnetic deflector through the pole piece assembly towards the opening in the pole piece assembly. This enables to increase the magnetic field value in the vicinity of the sample at the optical axis of the lens arrangement at a given electric current through the excitation coils of the magnetic deflector, without a need to increase a working distance.
Abstract:
An improved objective lens for a charged particle beam device is constituted by, among other things, a magnetic lens that creates a first magnetic field for focussing the charged particle beam onto the specimen. Furthermore, a deflector is integrated into the magnetic lens by providing at least one additional coil arrangement that creates a second magnetic field used to deflect the charged particle beam. Thereby, the second magnetic field is guided through at least one of the pole pieces of the magnetic lens. The present invention also provides an improved column for a charged particle beam device including the improved objective lens.
Abstract:
A charged particle beam column comprises: a particle source; an objective lens; a pre-lens deflection unit for deflecting a beam of charged particles away from the optical axis on such a path that the combined action of the objective lens and the pre-lens deflection unit directs the beam of charged particles towards the optical axis to hit the specimen surface from a first direction; and an in-lens deflection unit arranged in the vicinity of the objective lens for redirecting the deflected beam of charged particles on such a path that the combined action of the objective lens and the in-lens deflection unit redirects the beam of charged particles towards the optical axis to hit the specimen surface under said large beam landing angle from a second direction substantially opposite to said first direction.
Abstract:
A lens assembly having a magnetic lens assembly for a charged particle beam system is provided. The lens assembly includes: a first pole piece having a connecting portion of the first pole piece and a gap portion of the first pole piece, a second pole piece having a connecting portion of the second pole piece and a gap portion of the second pole piece, wherein the first pole piece and the second pole piece provide a gap at the respective gap portions, a coil for exciting the magnetic lens assembly, a centering element comprising a material that has a smaller Young's modulus than the material of the first and the material of the second pole piece, wherein the pole pieces are connected with each other at the respective connecting portions and have a centering element receiving portion towards the respective gap portion ends of the pole pieces.
Abstract:
An electron beam apparatus and a method for providing an energy-filtered primary electron beam are described. Therein, a primary electron beam having an asymmetric first energy distribution is generated by means of an electron source. The primary electron beam is high-pass energy filtered using a retarding lens.
Abstract:
A system and method for multi detector detection of electrons, the method includes the steps of directing a primary electron beam, through a column, to interact with an inspected object, directing, by introducing a substantial electrostatic field, electrons reflected or scattered from the inspected objects towards multiple interior detectors, whereas at least some of the directed electrons are reflected or scattered at small angle in relation to the inspected object; and receiving detection signals from at least one interior detector.
Abstract:
The present invention provides, according to a first aspect, a method for the examination of specimen with a beam of charged particles. The method provides one or more images of the specimen made with different view angles, so that, compared to a single image of the specimen, a lot of additional information about the specimen can be accessed. The different view angles (angles of incidence) are achieved by tilting the beam between the two images and moving the specimen to a new position so that the displacement of the beam caused by the tilting of the beam is compensated. Accordingly, while displaying/recording the second image the beam scans over the same area as it has scanned while displaying/recording the first image.
Abstract:
It is provided a charged particle beam device for inspecting a specimen, comprising a charged particle beam source adapted to generate a primary charged particle beam; an objective lens device adapted to direct the primary charged particle beam onto the specimen; and a detector device comprising one or more charged particle detectors adapted to detect a secondary charged particle beam generated by the primary charged particle beam at the specimen and passing through the objective lens device, the secondary charged particle beam comprising a first group of secondary charged particles starting from the specimen with high starting angles and a second group of secondary charged particles starting from the specimen with low starting angles; wherein at least one of the charged particle detectors is adapted to detect depending on the starting angles one group of the first and the second groups of secondary charged particles.
Abstract:
The present invention provides a charged particle beam device. The device comprises an emitter array for emitting a plurality of charged particle beams. The plurality of charged particle beams are imaged with a lens. An electrode unit is provided for accelerating the plurality of charged particle beams. The potential differences between a first potential of the emitter array, a second potential of the electrode unit, and a third potential of a specimen, are controlled by a first control unit and a second control unit. Thereby, the second potential is capable of accelerating the plurality of charged particle beams with respect to the first potential, and the third potential is capable of decelerating the plurality of charged particle beams with respect to the second potential.
Abstract:
A charged particle beam device is described. The charged particle beam device includes an emitter adapted for emitting a primary charged particle beam, a specimen location adapted for holding a specimen, from which secondary and/or backscattered charged particles are released on impingement of the primary charged particle beam, a detection unit adapted for detecting the secondary particles and/or secondary particles, and a beam guiding unit adapted for guiding the primary charged particle beam to the detection unit for impingement of a primary charged particle beam on the detection unit.