Microwave Window Resonator Arrays for Stable Wide-Area Plasma
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Solution Overview
Problem
Existing plasma processing apparatuses face challenges in generating high-density plasma over a wide range due to microwave interference between multiple radiators, leading to unstable plasma loads and reduced processing efficiency.
Innovation Solution
The apparatus incorporates a resonator array structure with card-shaped resonators that resonate with the magnetic field component of microwaves, allowing efficient propagation and absorption of microwave power beyond the skin depth of plasma, thereby suppressing interference and stabilizing plasma density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple microwave radiators are used to generate high-density plasma over a wide range, then plasma density and processing efficiency are improved, but microwave interference between radiators occurs causing unstable plasma loads
Solution Approach 1:
A dielectric plate is introduced as an intermediary component between the microwave radiators and the plasma. This dielectric plate serves as a mediator that transmits microwave energy while preventing direct interference between multiple radiators, thereby maintaining stable plasma loads while enabling high-density plasma generation over a wide area
Solution Approach 2:
The microwave radiation system is segmented into multiple independent radiators that operate separately through the dielectric plate. Each radiator can be controlled independently, and the dielectric plate segments the microwave paths to prevent interference between adjacent radiators while maintaining overall plasma density
2Quantity of substance
If multiple microwave radiators are used to increase plasma density, then processing capability is improved, but microwave interference causes reduced processing efficiency
Solution Approach 1:
The dielectric plate acts as a mediator that enables high plasma density by transmitting microwave energy from multiple radiators while preventing interference patterns that would reduce processing efficiency. This intermediary structure allows dense plasma generation without the harmful effects of microwave interference
3Quantity of substance
If microwave power is increased to generate high-density plasma, then plasma density is improved, but microwave interference leads to unstable plasma discharge
Solution Approach 1:
The dielectric plate serves as a stable intermediary that transmits high-power microwave energy while preventing interference between multiple radiators. This mediator enables increased microwave power for high-density plasma without compromising discharge stability, as the dielectric structure eliminates the interference that would otherwise cause instability
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 the generation of high-density plasma over a wide range by resonating microwaves with the resonators, ensuring stable plasma discharge and improved processing efficiency.
Implementation Method 1
a plurality of resonator array structures disposed on lower surfaces of the plurality of microwave transmission windows, respectively, and formed by arranging a plurality of resonators that are capable of resonance with a magnetic field component of the microwave
Implementation Method 2
a plurality of microwave radiators provided above the upper wall, and configured to radiate the microwave toward the processing chamber
Implementation Method 3
a plurality of microwave transmission windows provided at positions corresponding to the plurality of microwave radiators in the upper wall, and formed of a dielectric
Data Source
AI summary
A plasma processing apparatus comprises a processing chamber accommodating a substrate, and defining a processing space by an upper wall, a side wall, and a lower wall, a microwave generator configured to generate a microwave for generating plasma, a plurality of microwave radiators provided above the upper wall, and configured to radiate the microwave toward the processing chamber, a plurality of microwave transmission windows provided at positions corresponding to the plurality of microwave radiators in the upper wall, and formed of a dielectric, and a plurality of resonator array structures disposed on lower surfaces of the plurality of microwave transmission windows, respectively. The resonator array structures are formed by arranging a plurality of resonators that are capable of resonance with a magnetic field component of the microwave and are smaller in size than a wavelength of the microwave.