Micro-fluid Reactor In-Plane Micro-lenses Optical Signal Quality
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Solution Overview
Problem
Conventional methods for fabricating glass microstructures for micro-fluidic reactors result in translucent or opaque surfaces, which diminish the quality of optical signals and decrease optical power due to surface abnormalities, making them unsuitable for optical applications.
Innovation Solution
The development of a glass micro-fluidic reactor with in-plane micro-lenses that refract optical signals to preserve optical power and improve fiber-to-fiber coupling, using techniques such as etching and photomask patterning on a glass substrate to create transparent micro-channels and slots for optical fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to fabricate glass microstructures, then manufacturing is easier and cost-effective, but the surface becomes translucent or opaque causing light defocusing and decreasing optical power
Solution Approach 1:
The patent applies preliminary action by performing photomask patterning and etching processes before final assembly to create precisely controlled microstructures with smooth optical surfaces. The photomask is applied and patterned in advance, followed by controlled etching that preserves surface quality while creating the desired microchannel geometry.
Solution Approach 2:
The patent changes physical and chemical parameters during fabrication, including controlling etching depth, photomask exposure time, and chemical composition to achieve both precise dimensional control and smooth optical surfaces. These parameter adjustments resolve the contradiction between manufacturing ease and optical quality.
2Illumination intensity
If glass microstructures are fabricated with smooth surfaces for optical applications, then optical power is preserved, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into the glass substrate itself: the substrate serves as both the structural container and the optical element. By integrating the microchannels and optical paths within a single glass component with smooth internal surfaces, the design preserves optical power while avoiding the need for separate complex assembly processes.
Solution Approach 2:
The patent replaces mechanical surface finishing processes with chemical etching and photomask-based patterning. This substitution allows for precise control of surface smoothness and microstructure geometry without requiring complex mechanical polishing or machining operations.
3Measurement precision
If conventional glass fabrication is used, then manufacturing is simpler, but optical signals defocus and quality diminishes
Solution Approach 1:
The patent applies local quality by creating regions of different surface characteristics within the glass substrate. The areas requiring optical precision (microchannel walls, optical paths) are given smooth finished surfaces through controlled etching and photomask processing, while other areas can have different surface properties. This localized approach maintains optical signal quality without requiring entire fabrication processes to be overly complex.
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
The solution enhances optical power coupling and reduces light spread, resulting in improved monitoring and measurement capabilities of reagent fluids and reaction progress within the micro-fluidic reactor.
Implementation Method 1
A first plurality of micro-lenses may be positioned between the source fiber and a first wall of the micro-channel for directing an optical signal from the source fiber across a width of the micro-channel
Data Source
AI summary
A micro-fluidic reactor may comprise a photosensitive glass substrate with a plurality of features produced by etching. The features may include micro-channels, micro-lenses, and slots for receiving optical fibers. During operation of the micro-fluidic reactor, the optical fibers may transmit optical signals for measuring characteristics of fluid reagents and reactions taking place. The micro-lenses may focus optical signals from the optical fibers to create an approximately collimated optical path for the optical signals, reducing optical spread and enhancing fiber-to-fiber optical power coupling.