Monolithic Micro-LED Optical Sensor for Compact Microfluidic Analysis
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Solution Overview
Problem
Existing optical sensors are large in size, complex, and costly, making them unsuitable for on-site applications, and lack efficient integration of light sources and detection systems.
Innovation Solution
A monolithic integration device incorporating a micro-LED as a light source and a photo diode as an optical detector within a micro-fluidic channel or waveguide, allowing for compact, integrated sensing suitable for on-site use in micro Total Analysis Systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical sensors are used, then sensing function is achieved, but device size becomes large and complexity increases
Solution Approach 1:
The patent merges the light source (micro-LED) and optical detector into a single integrated chip structure, eliminating the need for separate external components. This integration directly reduces device size and complexity while maintaining the complete sensing function, as the micro-LED emits light through the waveguide and the detector receives it all within one compact unit.
Solution Approach 2:
The patent employs a planar waveguide structure that guides light in a two-dimensional plane, allowing the optical path to be folded within the chip plane rather than requiring three-dimensional space. This dimensional approach enables compact integration of the light source, waveguide, and detector in a flat, miniaturized configuration.
2Reliability
If traditional optical sensors are used, then sensing function is achieved, but manufacturing cost increases
Solution Approach 1:
By combining multiple functional components (micro-LED, waveguide, detector) into a single monolithic chip, the patent reduces the number of discrete parts that need to be manufactured, assembled, and aligned. This integration simplifies the manufacturing process, reduces assembly steps, and lowers overall production cost while maintaining sensing functionality.
Solution Approach 2:
The integrated chip structure is designed to be self-contained, with the micro-LED and detector automatically aligned through the waveguide structure during fabrication. This self-alignment eliminates the need for complex post-fabrication alignment procedures and reduces manufacturing complexity and cost.
3Reliability
If traditional optical sensors are used, then sensing function is achieved, but integration of light source and detector is inefficient
Solution Approach 1:
The patent physically integrates the micro-LED light source and optical detector within the same chip, connected by an on-chip planar waveguide. This merging eliminates external connections and alignment requirements, achieving efficient integration where the light source and detector work together as a unified system in close proximity.
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 enables a compact, cost-effective optical sensing system suitable for on-site applications, such as micro Total Analysis Systems, facilitating real-time analysis and accurate detection of biological or chemical characteristics.
Implementation Method 1
the micro-LED is coupled with the sensing channel and is configured for emitting light into the sensing channel
Implementation Method 2
the optical detector is coupled with the sensing channel and is configured for sensing the light which is emitted by the micro-LED
Implementation Method 3
The sensing channel is a waveguide in which the light emitted by the micro-LED can travel
Data Source
AI summary
The present invention discloses a monolithic integration device and micro Total Analysis System. The monolithic integration device for sensing comprises: a micro-LED; an optical detector; and a sensing channel, wherein the micro-LED is coupled with the sensing channel and is configured for emitting light into the sensing channel, and the optical detector is coupled with the sensing channel and is configured for sensing the light which is emitted by the micro-LED and travels through at least one part of the sensing channel. An embodiment of this invention proposes a new monolithic integration device for sensing with built-in light source and optical detection system.