Droplet Detector for Extreme Ultraviolet Light Generation
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Solution Overview
Problem
Current apparatuses for generating extreme ultraviolet light face inefficiencies due to unpredictable droplet positioning, dimension, and periodic cycle, leading to reduced generation efficiency and potential contamination of collector mirrors, with existing detection methods struggling to accurately monitor these parameters in real-time.
Innovation Solution
The apparatus employs a droplet detector with multiple pressure sensors arranged in symmetrical or lattice structures, along with temperature sensors, to monitor the position, dimension, and periodic cycle of droplets in real-time, allowing for precise control of the droplet generator to optimize the reaction with the light source, specifically using a CO2 laser, and adjust operations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If droplet positioning and parameters are left unpredictable, then the system is simpler, but extreme ultraviolet light generation efficiency deteriorates
Solution Approach 1:
The pressure sensors are positioned to detect droplet characteristics before the droplet reaches the interaction region with the light source. This preliminary detection allows the system to monitor and control droplet parameters (position, size, velocity) in advance, enabling optimization of extreme ultraviolet light generation efficiency without real-time intervention during the critical interaction phase.
Solution Approach 2:
Pressure sensors serve as intermediary detection elements that indirectly measure droplet characteristics by detecting pressure changes in the surrounding medium caused by the droplet. This intermediary approach enables non-intrusive monitoring of droplet parameters without directly contacting or interfering with the droplet itself.
2Measurement precision
If multiple pressure sensors are added to monitor droplet parameters, then measurement precision improves, but device complexity increases
Solution Approach 1:
The detection function is segmented across multiple pressure sensor elements arranged in a specific pattern. Each sensor element contributes to detecting different aspects of droplet parameters (position, size, velocity) by measuring local pressure changes. This segmentation allows precise reconstruction of droplet characteristics through signal processing and calculation based on the distributed sensor array.
3Object-affected harmful factors
If droplet parameters are not controlled, then operation is simpler, but contamination of collector mirrors worsens
Solution Approach 1:
The pressure sensors provide continuous feedback information about droplet parameters (position, size, velocity) to the droplet generation system. This feedback enables real-time monitoring and adjustment of droplet characteristics, ensuring that droplets are properly controlled and positioned to minimize contamination of collector mirrors while maintaining ease of operation through automated control.
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 enhances the efficiency of extreme ultraviolet light generation by ensuring droplets are provided at the correct position, dimension, and periodic cycle, minimizing contamination and optimizing the reaction process, thereby improving overall system performance and reducing unnecessary follow-up costs.
Implementation Method 1
a droplet detector which includes a plurality of pressure sensors, the pressure sensors detect a position of the droplet provided to the droplet collecting unit
Implementation Method 2
The droplet detector may further include at least one temperature sensor which senses a temperature of the droplet provided to the droplet collector
Implementation Method 3
specifically using a CO2 laser
Implementation Method 4
a droplet generator which provides a droplet to react with light from a light source to generate extreme ultraviolet light
Data Source
AI summary
An apparatus for generating extreme ultraviolet light includes a droplet generator which provides a droplet to react with light from a light source to generate extreme ultraviolet light, a droplet collector which collects the droplet, and a droplet detector which includes a plurality of pressure sensors, the pressure sensors detect a position of the droplet provided to the droplet collecting unit.