Polarization Control Unit for EUV Light Generation Efficiency
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Solution Overview
Problem
Current extreme ultraviolet (EUV) light generation systems face challenges in achieving efficient EUV light production for microfabrication at 32 nm or less, particularly in controlling the polarization state of laser beams to optimize energy absorption and plasma generation in semiconductor photolithography processes.
Innovation Solution
The system incorporates a polarization control unit within the laser apparatus to control the polarization state of the laser beam, allowing for efficient absorption and energy distribution on the target material, thereby enhancing the energy conversion efficiency during EUV light generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a laser beam is used to generate EUV light by irradiating a target material, then EUV light can be produced, but the energy conversion efficiency is insufficient and excessive energy is required for plasma formation
Solution Approach 1:
The patent applies parameter changes by controlling the polarization state of the laser beam (changing the electromagnetic parameter) to optimize energy absorption by the target material. By adjusting polarization parameters, the system achieves better energy conversion efficiency and reduces the total energy required for plasma formation and EUV light generation.
2Loss of energy
If the polarization state of the laser beam is not controlled, then the system is simpler, but energy absorption and plasma generation are inefficient
Solution Approach 1:
The patent introduces a polarization control unit that modifies the polarization parameter of the laser beam to enhance energy absorption efficiency. This controlled parameter change enables efficient plasma generation while maintaining a relatively compact system architecture.
Solution Approach 2:
The patent replaces potential mechanical adjustment mechanisms with optical polarization control elements (such as wave plates or polarizers) that can adjust the polarization state without moving parts, thereby achieving efficient energy absorption with minimal mechanical complexity.
3Reliability
If conventional laser parameters are used without polarization control, then the system is easier to operate, but EUV light output is unstable
Solution Approach 1:
The patent implements feedback control by monitoring the polarization state of the laser beam and adjusting it to maintain optimal conditions for stable EUV light generation. The polarization control unit responds to variations in laser parameters to ensure consistent plasma formation and reliable EUV output.
Solution Approach 2:
By actively controlling and stabilizing the polarization parameter of the laser beam, the system achieves reliable and stable EUV light output. The polarization control unit maintains optimal polarization conditions despite variations in other laser parameters, ensuring consistent plasma generation and EUV emission.
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 improves the energy conversion efficiency of EUV light generation, reducing the energy required for plasma formation and stabilizing the EUV light output, which is crucial for advanced microfabrication processes.
Implementation Method 1
at least one polarization control unit, provided on a laser beam path, for controlling a polarization state of the at least one laser beam
Implementation Method 2
a method for generating extreme ultraviolet light by irradiating a target material with at least one laser beam
Implementation Method 3
a laser produced plasma (LPP) type system using plasma produced by applying a laser beam onto a target
Data Source
AI summary
An extreme ultraviolet light generation system used with a laser apparatus may be provided, and the extreme ultraviolet light generation system may include: a chamber including at least one window for at least one laser beam and a target supply unit for supplying a target material into the chamber; and at least one polarization control unit, provided on a laser beam path, for controlling a polarization state of the at least one laser beam.