Multi-beam Electron Microscope Segmented Detector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multi-beam electron microscopes face challenges in detecting backscattered electrons effectively due to their mixing at the specimen surface, which limits the depth-related information and atomic number constitution analysis, as conventional detectors register a convoluted signal from multiple beams.
Innovation Solution
A backscattered electron detector is positioned proximal to the specimen with an array of apertures and a functionally sub-divided detection surface, allowing segregated detection of backscattered electron flux from each individual beam, using semiconductor or scintillator materials with pixelated doped regions or photon detectors to distinguish and register specific signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional detector is used to detect backscattered electrons from multiple beams, then the detector structure is simple, but the detection precision deteriorates due to signal mixing from multiple beams
Solution Approach 1:
The detector is divided into multiple detection zones corresponding to each electron beam in the array. Each detection zone independently detects backscattered electrons from its corresponding beam, preventing signal mixing and enabling precise measurement of backscattered electron flux from individual beams while maintaining a relatively simple overall detector structure.
2Measurement precision
If the detector is positioned far from the specimen, then the detector structure is simple, but the detection precision deteriorates due to backscattered electron flux mixing at the specimen surface
Solution Approach 1:
The detector surface is segmented into multiple detection zones that spatially correspond to the positions of individual electron beams. This segmentation allows the detector to be positioned close to the specimen without causing signal mixing, as each detection zone captures backscattered electrons from its corresponding beam location.
Solution Approach 2:
The detector is positioned in a different spatial dimension (close to the specimen surface) compared to conventional detectors, and the detection surface is divided into zones that map to beam positions. This dimensional approach allows close positioning while maintaining signal separation through spatial zonation.
3Productivity
If multiple beams are used to irradiate the specimen, then the productivity is improved through parallel imaging, but the detection precision deteriorates due to convoluted signals from multiple beams
Solution Approach 1:
The detector surface is segmented into multiple detection zones, each corresponding to a specific beam position in the array. This segmentation enables the detector to maintain high productivity by simultaneously detecting backscattered electrons from multiple beams while preserving detection precision by preventing signal mixing between beams.
Solution Approach 2:
Multiple detection zones are merged into a single detector structure, allowing simultaneous detection of backscattered electrons from multiple beams. This merging maintains the benefits of parallel imaging while the internal zonation prevents signal convolution, resolving the contradiction between productivity and precision.
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 configuration enables accurate and segregated detection of backscattered electrons from each beam, providing more depth-related information and atomic number data, enhancing the imaging capabilities of multi-beam electron microscopes.
Implementation Method 1
provided with an array of apertures that allow passage of said electron beams from said column to the specimen
Implementation Method 2
a backscattered electron detector that can be disposed proximal to the specimen at a side thereof facing said electron beam column
Implementation Method 3
using semiconductor or scintillator materials with pixelated doped regions or photon detectors to distinguish and register specific signals
Data Source
AI summary
An electron microscope comprising:A specimen holder, for holding a specimen;An electron beam column, for producing an array of electron beams and concurrently irradiating an array of target areas of said specimen therewith;A scanning assembly, for producing relative scanning motion of said beam array with respect to the specimen;A detector, for detecting radiation emanating from the specimen in response to said irradiation,wherein said detector is:A backscattered electron detector that can be disposed proximal to the specimen at a side thereof facing said electron beam column;Provided with an array of apertures that allow passage of said electron beams from said column to the specimen;Provided with a functionally sub-divided detection surface that enables segregated detection of a backscattered electron flux produced by each individual beam.