Optofluidic Lithography System for 3D Microstructures
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Solution Overview
Problem
Continuous-flow lithography is limited in producing three-dimensional microstructures with complex shapes and lacks real-time time-and-space flexibility due to its inability to create multi-layered structures and reliance on non-programmable photomasks.
Innovation Solution
An optofluidic lithography system with a two-layered microfluidic channel, featuring a pneumatic chamber and membrane, allows for adjustable channel height and real-time light modulation using a spatial light modulator, enabling the production of three-dimensional microstructures without the need for masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If continuous-flow lithography uses a photomask, then microstructure production is enabled, but real-time time-and-space flexibility is limited
Solution Approach 1:
The patent removes the photomask component from the lithography system entirely. Instead of using a physical mask to define patterns, the invention uses direct digital light projection onto the photocurable fluid in the microfluidic channel, eliminating the mask and enabling real-time programmable control of microstructure formation.
Solution Approach 2:
The patent replaces the mechanical photomask system with an optical projection system. Digital light patterns are projected directly onto the photocurable fluid, substituting the mechanical mask manipulation with optical field control, thereby achieving real-time flexibility without physical mask changes.
2Manufacturing precision
If continuous-flow lithography uses a single microfluidic channel, then simple microstructure production is enabled, but three-dimensional complex structures cannot be produced
Solution Approach 1:
The patent divides the single microfluidic channel into multiple stacked channels (first microfluidic channel and second microfluidic channel), each capable of forming separate layers. This segmentation allows independent control of each channel's photocurable fluid, enabling the formation of multi-layer three-dimensional microstructures through sequential or simultaneous curing.
Solution Approach 2:
The patent transitions from a two-dimensional single-channel system to a three-dimensional multi-layer system by stacking multiple microfluidic channels vertically. This adds the vertical dimension (z-axis) to the traditional planar (x-y axis) lithography, enabling true 3D microstructure fabrication.
3Manufacturing precision
If membrane displacement is increased to adjust microfluidic channel height, then three-dimensional microstructure formation is enabled, but pneumatic chamber pressure control complexity increases
Solution Approach 1:
The patent implements a dynamic height adjustment system where the membrane can be displaced by controlling pneumatic chamber pressure. This allows the microfluidic channel height to be dynamically changed during operation, enabling flexible control over the thickness of each cured layer and the overall 3D structure geometry without requiring complex mechanical adjustment mechanisms.
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 reduces manufacturing complexity and costs, enhances time-and-space flexibility, and allows for the creation of microstructures with varied shapes and compositions, including those with multiple layers and different materials.
Implementation Method 1
The pneumatic chamber induces the displacement of the membrane depending on an internal atmospheric pressure thereof
Implementation Method 2
The fluid is cured by light irradiated from the bottom to form a microstructure
Data Source
AI summary
An optofluidic lithography system including a membrane, a microfluidic channel, and a pneumatic chamber is provided. The membrane may be positioned between a pneumatic chamber and a microfluidic channel. The microfluidic channel may have a height corresponding to a displacement of the membrane and have a fluid flowing therein, the fluid being cured by light irradiated from the bottom to form a microstructure. The pneumatic chamber may induce the displacement of the membrane depending on an internal atmospheric pressure thereof.