Unitary Oxide Sheet for Microcavity Plasma Arrays

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Solution Overview

Problem

Existing microcavity and microchannel plasma device arrays require precise alignment and bonding of separate electrode sheets, which is challenging and costly, and can lead to electrical breakdown, reducing array reliability and lifetime.

Innovation Solution

Integrating complete driving electrodes, microcavities or microchannels, and electrical connections into a single unitary sheet of oxide, eliminating the need for precise sheet alignment and reducing the risk of electrical breakdown.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If separate electrode sheets are used to form microcavity plasma device arrays, then the fabrication process allows for modular construction, but precise alignment and bonding become challenging and costly, and electrical breakdown risk increases

Engineering Contradiction:

Improvemodular constructionVSAvoidalignment precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent combines multiple separate electrode sheets into a single unitary sheet containing all driving electrodes integrated within the oxide matrix. This merging eliminates the need for alignment and bonding operations between separate sheets, directly resolving the contradiction by sacrificing modular construction for manufacturing precision and ease of manufacture.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention uses a composite structure where metal electrodes are embedded within and encapsulated by the oxide matrix, forming a unified material system. This composite approach allows all electrodes to be formed in a single sheet through the oxide layer, eliminating interface problems between separate sheets while maintaining ease of manufacture.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If separate electrode sheets are bonded together to form microcavity plasma device arrays, then modular construction is enabled, but array lifetime is reduced due to increased probability of electrical breakdown along the surface

Engineering Contradiction:

Improvemodular constructionVSAvoidarray lifetime

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

By merging all electrode functions into a single unitary sheet with electrodes embedded in the oxide matrix, the invention eliminates bonding interfaces entirely. This removes the sources of electrical breakdown that would occur at sheet interfaces, directly improving reliability and array lifetime while maintaining ease of manufacture.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention converts the potential harm of having multiple sheet interfaces (which cause electrical breakdown) into a benefit by using the oxide matrix itself as the encapsulating and isolating medium. The oxide layer that would normally be a barrier between sheets becomes the medium in which all electrodes are safely embedded, eliminating breakdown risks.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If separate electrode sheets are aligned and bonded with small alignment errors (fraction of microcavity dimension), then addressable arrays can be formed, but the fabrication process becomes costly and complex

Engineering Contradiction:

Improveaddressable array formationVSAvoidfabrication process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges all electrode patterns into a single unitary sheet, eliminating the need for multi-sheet alignment operations. This directly reduces fabrication process complexity while maintaining the ability to form addressable arrays, as all electrodes can be precisely positioned in the single sheet without iterative alignment steps.

Inventive Principle:

Principle #5Merging (Combining)

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 simplifies fabrication, enhances reliability, and extends the lifetime of microplasma device arrays by eliminating sheet-sheet interfaces and edge effects, enabling efficient plasma generation and operation at high pressures with improved spectral emission.

Implementation Method 1

arranged so as to generate and sustain a plasma in the embedded microcavities or microchannels upon application of time-varying voltage

Methodology Applied

Scientific EffectPlasma generation: Plasma

Implementation Method 2

encapsulated metal driving electrodes isolated by oxide from the microcavities or microchannels

Methodology Applied

Scientific EffectDielectric isolation: Dielectric

Data Source

PatentUS8890409B2Microcavity and microchannel plasma device arrays in a single, unitary sheet

Publication Date: 2014.11.18 THE BOARD OF TRUSTEES OF THE UNIV OF ILLINOIS

AI summary

An array of microcavity plasma devices is formed in a unitary sheet of oxide with embedded microcavities or microchannels and encapsulated metal driving electrodes isolated by oxide from the microcavities or microchannels and arranged so as to generate sustain a plasma in the embedded microcavities or microchannels upon application of time-varying voltage when a plasma medium is contained in the microcavities or microchannels.