Particle-optical systems and arrangements and particle-optical components for such systems and arrangements
First Claim
1. An electron-optical arrangement providing a primary electron beam path for a beam of primary electrons directed from a primary electron source to an object positionable in an object plane of the arrangement, and a secondary electron beam path for secondary electrons originating from the object, the electron microscopy arrangement comprising a magnet arrangement having:
- a first magnetic field region traversed by the primary electron beam path and the secondary electron beam path for separating the primary electron beam path and the secondary electron beam path from each other,a second magnetic field region arranged in the primary electron beam path upstream of the first magnetic field region, wherein the second magnetic field region is not traversed by the secondary electron beam path, and wherein the first and second magnetic field regions deflect the primary electron beam path in substantially opposite directions,a third magnetic field region arranged in the secondary electron beam path downstream of the first magnetic field region, wherein the third magnetic field region is not traversed by the first electron beam path, and wherein the first and third magnetic field regions deflect the secondary electron beam path in a substantially same direction.
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Accused Products
Abstract
An electron-optical arrangement provides a primary beam path for a beam of primary electrons and a secondary beam path for secondary electrons. The electron-optical arrangement includes a magnet arrangement having first, second and third magnetic field regions. The first magnetic field region is traversed by the primary beam path and the secondary beam path. The second magnetic field region is arranged in the primary beam path upstream of the first magnetic field region and is not traversed by the secondary beam path. The first and second magnetic field regions deflect the primary beam path in substantially opposite directions. The third magnetic field region is arranged in the secondary beam path downstream of the first magnetic field region and is not traversed by the first beam path. The first and third magnetic field regions deflect the secondary beam path in a substantially same direction.
108 Citations
24 Claims
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1. An electron-optical arrangement providing a primary electron beam path for a beam of primary electrons directed from a primary electron source to an object positionable in an object plane of the arrangement, and a secondary electron beam path for secondary electrons originating from the object, the electron microscopy arrangement comprising a magnet arrangement having:
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a first magnetic field region traversed by the primary electron beam path and the secondary electron beam path for separating the primary electron beam path and the secondary electron beam path from each other, a second magnetic field region arranged in the primary electron beam path upstream of the first magnetic field region, wherein the second magnetic field region is not traversed by the secondary electron beam path, and wherein the first and second magnetic field regions deflect the primary electron beam path in substantially opposite directions, a third magnetic field region arranged in the secondary electron beam path downstream of the first magnetic field region, wherein the third magnetic field region is not traversed by the first electron beam path, and wherein the first and third magnetic field regions deflect the secondary electron beam path in a substantially same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A multi-electron-beamlet inspection system, comprising:
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a stage for mounting an object to be inspected; an electron source arrangement for generating an array of primary electron beamlets; an objective lens for focusing each of the primary electron beamlets on the object, wherein an array of secondary electron beamlets is generated by the primary electron beamlets, the secondary electron beamlets traversing the objective lens; a beam splitter for separating a secondary electron beam path of the secondary electron beamlets from a primary electron beam path of the primary electron beamlets; a detector arrangement for producing an array of signals corresponding to the array of secondary electron beamlets; wherein the beam splitter includes a magnet arrangement having; a first magnetic field region traversed by the primary electron beam path and the secondary electron beam path for separating the primary electron beam path and the secondary electron beam path from each other, a second magnetic field region arranged in the primary electron beam path upstream of the first magnetic field region, wherein the second magnetic field region is not traversed by the secondary electron beam path, and wherein the first and second magnetic field regions deflect the primary electron beam path in substantially opposite directions, a third magnetic field region arranged in the secondary electron beam path downstream of the first magnetic field region, wherein the third magnetic field region is not traversed by the first electron beam path, and wherein the first and third magnetic field regions deflect the secondary electron beam path in a substantially same direction.
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24. A method of multi-electron-beamlet inspection of a substrate, the method comprising:
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generating an array of primary electron beamlets; focusing each primary electron beamlet on the substrate such that an array of secondary electron beamlets emanating from the substrate is generated; detecting intensities of the secondary electron beamlets; and separating a secondary electron beam path of the secondary electron beamlets from a primary electron beam path of the primary electron beamlets using a beam splitter, the beam splitter including a magnet arrangement having; a first magnetic field region traversed by the primary electron beam path and the secondary electron beam path for separating the primary electron beam path and the secondary electron beam path from each other, a second magnetic field region arranged in the primary electron beam path upstream of the first magnetic field region, wherein the second magnetic field region is not traversed by the secondary electron beam path, and wherein the first and second magnetic field regions deflect the primary electron beam path in substantially opposite directions, and a third magnetic field region arranged in the secondary electron beam path downstream of the first magnetic field region, wherein the third magnetic field region is not traversed by the first electron beam path, and wherein the first and third magnetic field regions deflect the secondary electron beam path in a substantially same direction.
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Specification