In Situ Planar Sample Preparation via Adjustable Beam Shield
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Solution Overview
Problem
Current sample preparation methods for microscopy, such as mechanical polishing and focused ion beam milling, are inadequate for novel multi-phase and multi-layered materials, as they often lead to structural alteration, charge build-up, and distortion, making it difficult to achieve accurate and reproducible planar surfaces for analysis.
Innovation Solution
A system for in situ sample preparation within a vacuum chamber using a sample support, an excitation beam, and a vertically adjustable beam shield to sequentially expose and mill planar surfaces, allowing real-time monitoring and analysis, and enabling the capture of additional compositional data without breaking vacuum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical polishing or FIB milling is used to prepare sample surfaces, then material removal and surface flattening are achieved, but structural alteration, charge build-up, and distortion occur in novel multi-phase and multi-layered materials
Solution Approach 1:
The patent replaces mechanical polishing systems with a focused ion beam system that uses ion bombardment for material removal. This substitution eliminates mechanical contact forces that cause structural alteration, charge build-up, and distortion in novel materials, while still achieving surface flattening and planarization through controlled sputtering processes
Solution Approach 2:
The patent employs parameter changes by adjusting ion beam energy, current density, and incident angle to optimize material removal rates while minimizing damage to the sample structure. By dynamically controlling these parameters, the system achieves surface preparation without the harmful effects associated with conventional mechanical methods
2Measurement precision
If FIB systems are used to mill precise site-specific sub-surface features, then spatial precision is improved, but the excavated area remains very small and time consumption increases
Solution Approach 1:
The patent segments the ion beam into multiple parallel beams arranged in an array configuration. This allows simultaneous milling of multiple locations across the sample surface, dramatically increasing the total excavated area while maintaining the spatial precision of individual beam spots. The segmented beam approach enables parallel processing without sacrificing resolution
Solution Approach 2:
The patent transitions from a single-point, one-dimensional milling approach to a multi-point, two-dimensional parallel milling approach. By arranging ion beams in a spatial array, the system expands the excavated area across the sample surface while maintaining precision at each location, effectively adding a dimensional aspect to the milling process
3Ease of manufacture
If samples are prepared outside the vacuum chamber, then conventional preparation techniques can be used, but oxidative effects occur and analysis requires breaking vacuum
Solution Approach 1:
The patent merges the sample preparation function with the analysis vacuum chamber into a single integrated system. The ion beam milling capability is incorporated directly within the vacuum environment, allowing surface preparation to occur in-situ without exposure to atmospheric oxygen. This combination eliminates oxidative effects while maintaining ease of operation through unified control of preparation and analysis processes
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 efficient and reproducible preparation of planar surfaces, reducing artifacts and oxidative effects, allowing for immediate analysis and 3D reconstruction of samples, while maintaining the integrity of the sample structure and providing simultaneous analytical data capture.
Implementation Method 1
an excitation beam to remove material from the surface of the sample
Implementation Method 2
an excitation beam to remove material from the surface of the sample
Data Source
AI summary
Systems for preparing solid samples for microscopic examination in cross section or planametric orientation. The sample preparation systems include a sample support, an excitation beam to remove material from the surface of the sample, and a beam shield that protects the sample from the excitation beam, where sequential vertical adjustment of the beam shield permits the selective exposure of a series of substantially planar sample surfaces.