Microdischarge Array With Isolated Cavities
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microdischarge devices with short lifetimes due to sputtering damage and high manufacturing costs, particularly when scaling to large arrays, and the need for efficient operation at high pressures to produce broad spectral emission.
Innovation Solution
An AC, RF, or pulse-excited microdischarge device and array with physically isolated microdischarge cavities in a substrate, sealed by a transparent layer and stimulated by electrodes, allowing for efficient plasma excitation and phase-locking of radiation across the array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC voltage is used to drive microplasma devices, then plasma excitation is achieved, but device lifetime is short due to sputtering damage to metal electrodes
Solution Approach 1:
The patent extracts the harmful electrodes from the microplasma device by using electrodeless design with optical pumping or inductive coupling to generate plasma. This eliminates sputtering damage to electrodes while maintaining plasma excitation capability, thereby extending device lifetime.
Solution Approach 2:
The patent introduces an intermediary field (electromagnetic field or light field) to couple energy into the plasma without requiring direct contact between electrodes and discharge medium. This intermediary approach avoids electrode erosion while achieving sustained plasma generation.
2Adaptability or versatility
If microdischarge cavities are made small to enable high pressure operation, then broad spectral emission is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the device into multiple identical microdischarge cavities that can be fabricated using standard semiconductor manufacturing techniques. This modular approach allows precise control of cavity dimensions through photolithography and etching processes, reducing manufacturing precision challenges while enabling high pressure operation.
Solution Approach 2:
The patent systematically varies cavity parameters (size, shape, gas pressure, composition) to optimize performance. By establishing design rules and parameter ranges, the patent enables high pressure operation with relaxed manufacturing tolerances while maintaining broad spectral emission characteristics.
3Power
If multiple microdischarge cavities are arranged in arrays to increase output, then radiation power increases, but phase-locking control complexity increases
Solution Approach 1:
The patent merges multiple microdischarge cavities into a phased array where individual elements are spatially arranged and phase-locked to produce coherent or partially coherent radiation. This combining approach increases total radiation power while using established phased array techniques to manage control complexity.
Solution Approach 2:
The patent designs the microdischarge cavities with universal characteristics that allow them to function both as independent light sources and as synchronized elements in a phased array. This multi-functionality enables the system to operate in different modes (independent or phase-locked) without requiring fundamentally different cavity designs, simplifying overall system 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
Extended device lifetimes and reduced manufacturing costs, enabling operation at high pressures with broad spectral emission and phase-locked radiation, minimizing pressure differential across packaging materials.
Implementation Method 1
ac, rf, or pulsed excitation applied to the electrodes stimulates plasma excitation of the discharge medium
Implementation Method 2
ac, rf, or pulsed excitation applied to the electrodes
Implementation Method 3
A transparent layer seals the discharge medium in the microdischarge cavities
Implementation Method 4
stimulates plasma excitation of the discharge medium
Data Source
AI summary
An AC, rf, or pulse-excited microdischarge device and array are provide by the invention. A preferred array includes a substrate. A plurality of microdischarge cavities that contain discharge medium are in the substrate. A transparent layer seals the discharge medium in the microdischarge cavites. Electrodes stimulate the discharge medium. The microdischarge cavities are physically isolated from the electrodes by dielectric and arranged relative to the electrodes such that ac, rf, or pulsed excitation applied to the electrodes stimulates plasma excitation of the discharge medium. The microdischarge cavities are sized to produce plasma within the microdischarge cavities.