Charged Particle Beam Aberration Correction Using Tilt Patterns
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Solution Overview
Problem
Optical aberrations in charged particle beam microscopes limit the resolution of images, hindering the ability to investigate and analyze structural details on an atomic scale.
Innovation Solution
A system and method that measure and correct optical aberrations in charged particle beam microscopes by applying a time series of beam tilts in a pattern, such as a Lissajous figure, to induce image shifts, which are then analyzed to determine aberration values using image processing techniques or neural networks, allowing for real-time correction of components like lens systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission electron microscopy is used to achieve high resolution imaging, then atomic scale structural details can be investigated, but optical aberrations in the microscope limit the resolution
Solution Approach 1:
The system performs preliminary measurement of optical aberrations by applying beam tilts and analyzing induced image shifts before actual imaging. The aberration values are determined in advance and used to generate correction values, allowing the microscope to compensate for aberrations proactively rather than reactively, thereby maintaining optimal resolution
Solution Approach 2:
The system implements a feedback loop where beam tilts are applied, image shifts are measured, aberration values are determined, and correction values are generated based on these measurements. This continuous feedback mechanism allows real-time monitoring and correction of optical aberrations, ensuring sustained high resolution imaging capability
2Measurement precision
If beam tilts are applied to measure optical aberrations, then aberration values can be determined, but image shifts must be precisely measured and analyzed
Solution Approach 1:
The system applies beam tilts in a periodic pattern (such as Lissajous figures) rather than random or continuous tilts. This periodic application creates predictable, repeating image shift patterns that are easier to analyze and correlate with specific aberration types, reducing the complexity of measurement while maintaining accuracy
Solution Approach 2:
The system changes beam tilt parameters (magnitude, direction, timing) in a controlled manner to induce measurable image shifts. By systematically varying these parameters and analyzing the resulting image shift patterns, the system can determine aberration values more easily than with arbitrary tilt applications
3Measurement precision
If real-time correction of optical aberrations is implemented, then image resolution is enhanced, but the system complexity increases
Solution Approach 1:
The microscope system performs self-diagnosis and self-correction by measuring its own optical aberrations and generating appropriate correction values. The system uses its existing imaging components to measure aberrations and applies corrections through its existing beam control mechanisms, eliminating the need for separate external measurement and correction systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate estimation and correction of aberrations, enhancing image resolution and robustness against external effects like specimen drift and mechanical vibrations, thereby improving the microscope's ability to produce high-resolution images.
Implementation Method 1
Transmission electron microscopy (TEM) is a technique in which a beam of electrons is transmitted through a thin sample to form an image. The image is formed by the interaction of the electrons with atoms of the sample as the electrons are transmitted through the sample.
Implementation Method 2
one or more beam deflectors disposed along the optical axis and controllable by the pattern to apply a time series of beam tilts to the charged particle beam
Data Source
AI summary
A charged particle beam microscope system is operated in a transmission imaging mode. During the operation, the charged particle beam microsystem directs a charged particle beam to the sample to produce images. A time series of beam tilts is applied in a pattern to the charged particle beam directed to the sample to produce a sequence of images. At least some of the images in the sequence of images are captured while the charged particle beam is transitioning between one beam tilt in the time series of beam tilts and a sequentially adjacent beam tilt in the time series of beam tilts. The pattern is configured to induce image changes between the images in the sequence of images that are indicative of optical aberrations in the charged particle beam microscope system.