Parallel Resonance Antenna for Uniform Radial Plasma Control
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Solution Overview
Problem
Plasma processing systems face challenges in achieving uniform electromagnetic field distribution within the plasma processing chamber, leading to non-uniform treatment of substrates due to varying plasma densities across different regions.
Innovation Solution
The proposed solution involves a radiating structure with sets of arms forming resonant circuits, which can operate in single or parallel resonance modes, allowing for radial control of plasma density profiles by adjusting RF waveforms and capacitive couplings, ensuring uniform electromagnetic field distribution across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional single resonance antenna is used, then the structure is simple, but the electromagnetic field distribution is non-uniform leading to non-uniform substrate treatment
Solution Approach 1:
The antenna is divided into multiple arms (typically four arms extending radially from a central feed point), each arm forming part of a resonant circuit. This segmentation allows independent control of electromagnetic field distribution in different radial directions, enabling uniform substrate treatment while maintaining a relatively simple overall structure.
Solution Approach 2:
Each arm of the antenna is equipped with adjustable capacitive elements that can be independently tuned to optimize the electromagnetic field distribution in specific regions. This local adjustability ensures uniform plasma density across the substrate surface while keeping the global antenna structure simple.
2Quantity of substance
If the electromagnetic field is intensified to improve plasma density, then plasma generation is enhanced, but the radial distribution becomes non-uniform
Solution Approach 1:
The antenna incorporates adjustable capacitive elements in each arm that can be dynamically tuned during operation. This dynamic adjustment capability allows optimization of plasma density while maintaining uniform radial distribution, as each arm can be independently adjusted to compensate for variations in electromagnetic field intensity.
Solution Approach 2:
By changing the capacitive parameters in each arm of the antenna, the resonant frequency and impedance can be adjusted to achieve uniform electromagnetic field distribution. This parameter adjustment enables high plasma density while maintaining uniformity across the substrate surface.
3Manufacturing precision
If multiple resonant circuits with different frequencies are used, then radial plasma control is improved, but the device complexity increases
Solution Approach 1:
The antenna structure serves multiple functions: it generates electromagnetic fields for plasma production, provides adjustable resonant circuits for radial plasma control, and maintains a unified geometric configuration. The same arm structure is used for all resonant circuits, reducing overall device complexity while enabling precise radial plasma control through frequency and capacitive adjustments.
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 controlled center-to-edge variation in plasma density, enhancing the uniformity of substrate treatment and improving the radial distribution of the electromagnetic field, thereby addressing the non-uniformity issues in existing plasma processing systems.
Implementation Method 1
Each first arm has a first inductance and is coupled to a respective first capacitor and a respective second capacitor of the resonating structure to form a corresponding first resonant circuit operating at a first resonance frequency. Each second arm has a second inductance and is coupled to a respective third capacitor and a respective fourth capacitor of the resonating structure to form a corresponding second resonant circuit operating at a second resonance frequency.
Data Source
AI summary
According to an embodiment, a radiating structure of a resonating structure used for plasma processing is disclosed. The radiating structure includes a set of first arms and a set of second arms. Each first arm has a first inductance and is coupled to a respective first capacitor and a respective second capacitor of the resonating structure to form a corresponding first resonant circuit operating at a first resonance frequency. Each second arm has a second inductance and is coupled to a respective third capacitor and a respective fourth capacitor of the resonating structure to form a corresponding second resonant circuit operating at a second resonance frequency. In a first mode of operation, the resonating structure operates as a single resonance antenna. In a second mode of operation, the resonating structure operates as a parallel resonance antenna.