Detector Positioning in Particle Beam Columns for Symmetric Edge Brightness
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Solution Overview
Problem
Existing microlithography masks suffer from defects with asymmetrical edge brightness in scanning electron microscope images, leading to issues in automated structure recognition and potential errors in repair processes.
Innovation Solution
A column for analyzing and processing samples, equipped with a detector device that can be positioned optimally relative to the optical axis, allowing for symmetrical edge brightness correction, using a positioning device that maintains the detector's position without disassembly, even under thermal or mechanical changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detector device is fixed in position, then the device complexity is reduced, but the edge brightness symmetry deteriorates due to thermal or mechanical changes in the column
Solution Approach 1:
The detector device is made dynamically adjustable through a positioning device that enables movement in the plane perpendicular to the beam direction. This allows the detector to be repositioned to achieve optimal edge brightness symmetry while maintaining the ability to adapt to thermal or mechanical changes in the column, resolving the contradiction between fixed simplicity and dynamic performance.
2Measurement precision
If the detector device can be repositioned, then the measurement precision is improved, but the ease of operation deteriorates due to positioning adjustments
Solution Approach 1:
The positioning device is designed to enable the detector device to self-adjust to optimal positions for achieving symmetrical edge brightness. The system provides tools and mechanisms that facilitate easy repositioning without requiring complex external intervention, allowing operators to achieve precise measurements while maintaining operational simplicity.
3Manufacturing precision
If the detector device requires disassembly for positioning, then the manufacturing precision is improved, but the loss of time increases due to maintenance downtime
Solution Approach 1:
The positioning device enables the detector device to be adjusted in situ without requiring disassembly from the column. This dynamic adjustment capability allows for precise alignment and positioning while the detector remains installed, eliminating the need for time-consuming disassembly and reassembly operations during maintenance or calibration.
Solution Approach 2:
The invention replaces the traditional mechanical disassembly-based positioning system with a more advanced positioning mechanism that allows for in situ adjustment. This substitution enables precise detector alignment through controlled movement within the installed configuration, significantly reducing maintenance downtime while maintaining or improving alignment 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
Ensures symmetrical edge brightness in images, reducing errors in automated recognition and repair processes, and minimizing maintenance downtime by allowing in situ positioning of the detector device.
Implementation Method 1
a particle source configured to emit a particle beam in a first direction onto a sample
Implementation Method 2
a detector device configured to detect particles moving in a second direction opposite to the first direction
Data Source
AI summary
A column for analyzing and/or processing a sample, for example a mask for a lithography apparatus, comprising a particle source configured to emit a particle beam in a first direction onto the sample, a detector device configured to detect particles moving in a second direction opposite to the first direction, and a positioning device configured to position the detector device in a plane oriented perpendicular to the first direction.