Multi-Holed Aperture Plate for Charged Particle Microscope
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Solution Overview
Problem
Conventional charged particle microscopes suffer from image artifacts and low signal-to-noise ratio due to the use of single-holed aperture plates, which limit their resolution and accuracy in imaging and focus measurement.
Innovation Solution
A multi-holed aperture plate is introduced, which converts a singular incident beam into multiple sub-beams with varying cross-sectional shapes, reducing image noise and enhancing signal-to-noise ratio by smoothing the optics-related frequency spectrum and providing additional parameters for focus control and resolution improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-holed aperture plate is used, then the device structure is simple, but image artifacts increase and signal-to-noise ratio decreases
Solution Approach 1:
The aperture plate is divided into multiple holes instead of using a single hole. This segmentation allows the incident beam to be split into multiple sub-beams with different cross-sectional shapes, which smooths the optics-related frequency spectrum and reduces image artifacts while improving signal-to-noise ratio.
2Device complexity
If a single-holed aperture plate is used, then the device structure is simple, but resolution and focus measurement accuracy are limited
Solution Approach 1:
The aperture plate is divided into multiple holes instead of using a single hole. This segmentation allows the incident beam to be split into multiple sub-beams with different cross-sectional shapes, which smooths the optics-related frequency spectrum and reduces image artifacts while improving signal-to-noise ratio.
3Reliability
If a multi-holed aperture plate is introduced, then image artifacts are reduced and signal-to-noise ratio is enhanced, but device complexity increases
Solution Approach 1:
The aperture plate is divided into multiple holes instead of using a single hole. This segmentation allows the incident beam to be split into multiple sub-beams with different cross-sectional shapes, which smooths the optics-related frequency spectrum and reduces image artifacts while improving signal-to-noise ratio.
4Measurement precision
If a multi-holed aperture plate is introduced, then resolution and focus control are improved, but device complexity increases
Solution Approach 1:
The aperture plate is divided into multiple holes instead of using a single hole. This segmentation allows the incident beam to be split into multiple sub-beams with different cross-sectional shapes, which smooths the optics-related frequency spectrum and reduces image artifacts while improving signal-to-noise ratio.
Data Source
AI summary
A Charged Particle Microscope includesA specimen holder, for holding a specimen;A source, for producing a beam of charged particles;An illuminator, for directing said beam so as to irradiate the specimen; andA detector, for detecting a flux of radiation emanating from the specimen in response to said irradiation.The illuminator includes:An aperture plate comprising an aperture region in a path of said beam, for defining a geometry of the beam prior to its impingement upon said specimen.The aperture region includes a distribution of multiple holes, each of which is smaller than a diameter of the beam incident on the aperture plate.