Abstract:
The invention provides an optical system for a charged particle multi-beam system. The optical system comprises an electrostatic lens component and a magnetic lens component. The components are used to focus a plurality of charged particle beams in a separate opening for each of at least a plurality a charged particle beams traveling through the optical system.
Abstract:
Disclosed is a lens array having a laterally movable axis for corpuscular rays, particularly for transmission from areas of an object surface onto the focal plane by means of electrons. The inventive array consists of a combined lens comprising a cylinder lens and a quadrupole lens provided with slit diaphragms which can be impinged upon by electric and/or magnetic fields. The optical axis of the quadrupole lens is oriented parallel to the axis of the cylinder lens and defines the optical axis of the projection, the position of which can be altered in relation to the axis of the cylinder lens. The quadrupole lens is in focus in the sector in which the cylinder lens is not in focus and is out of focus in the section in which the cylinder lens is in focus. The inventive combined lens can be operated as an immersion lens for projecting secondary electrons. The immersion field consists of at least two adjacent axially aligned fields. The first field lies between the object and the first slit diaphragm, and the second field lies between the first slit diaphragm and the second slit diaphragm. Both fields can be focused independently from each other. The potential difference between the object and the first diaphragm is comparatively small in relation to the potential difference between the first diaphragm and the second diaphragm, and the potential course between the object and the first diaphragm has to be approximately linear. The combined lens is brought into/out of focus by superposing the immersion field, the cylinder lens field, and the quadrupole field. Alternatively, the lens array can be used as a cathode lens for a photocathode with several homogenous adjacent emission areas.
Abstract:
A new multi-beam apparatus with a total FOV variable in size, orientation and incident angle, is proposed. The new apparatus provides more flexibility to speed the sample observation and enable more samples observable. More specifically, as a yield management tool to inspect and/or review defects on wafers/masks in semiconductor manufacturing industry, the new apparatus provide more possibilities to achieve a high throughput and detect more kinds of defects.
Abstract:
An objective lens (100) for focussing charged particles comprises a magnetic lens and an electrostatic lens whose components are displaceable relative to each other. The bore of the outer pole piece (2) of the magnetic lens exhibits a diameter Da which is larger than a diameter Di of the bore of the inner pole piece (1) of the magnetic lens, wherein the following relationship is satisfied: 1.5-Di = Da = 3-Di, and wherein the lower end of the inner pole piece is disposed in a distance of at least 2 mm offset from the inner end of the outer pole piece in a direction of the optical axis OA.
Abstract translation:用于聚焦带电粒子的物镜(100)包括磁性透镜和其组件相对于彼此移位的静电透镜。 磁性透镜的外极片(2)的孔的直径Da大于磁性透镜的内极片(1)的孔径Di,其中满足以下关系:1.5- Di = Da = 3-Di,并且其中内极片的下端设置在与光轴OA的方向上的外极片的内端偏移至少2mm的距离处。
Abstract:
A particle-optical arrangement composed of an electron microscopy system (3) and an ion beam processing system (7) comprises an objective lens (43) of the electron microscopy system, said lens having an annular electrode (59), which is a component of the electron microscopy system that is arranged closest to a position (11) of an object to be examined. A shielding electrode (81) is arranged between the annular electrode and a principal axis (9) of the ion beam processing system (7).
Abstract:
Disclosed herein is an electron column using a magnetic lens layer. The electron column includes a magnetic lens layer for condensing an electron beam using permanent magnets. The magnetic lens layer includes a support plate, an aperture formed through the support plate, and permanent magnets arranged around the aperture and disposed on or inserted into the support plate.
Abstract:
Spherical aberration coefficient and chromatic aberration coefficient in an electronic probe irradiation system are decreased by using an object lens which consists of an electrostatic lens and a magnetic field-type lens, in order to efficiently detect the formed secondary electrons through a hole of the electrostatic lens. In the charged particle ray apparatus which permits the sample to be selectively irradiated with positive ions and electrons, furthermore, the electron beam is focused on the sample using the object lens which consists of the electrostatic lens and the magnetic field-type lens. The beam is focused on the sample by the magnetic field action of the electrostatic lens that is maintained at the same polarity as the case when the positive ion beam and the electrons are focused; i.e., positive ions and electrons are focused on the same sample position maintaining the strength of the object lens nearly constant.
Abstract:
An apparatus includes a magnetic adjustment lens (116) positioned at the electron beam path between the electron source (102) and sample (124), the magnetic adjustment lens excited by an electric coil, and a permanent magnet lens (118) positioned below the magnetic adjustment lens to focus the electron beam onto the sample surface, the permanent magnet lens excited by one or more permanent ring magnets enclosed except on a bottom surface by a magnetic field conductor. The magnetic adjustment lens may be excited to eliminate magnetic field leakage of the permanent magnet lens.