Dual-Beam Laser Transfer for High-Resolution Material Patterning
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Solution Overview
Problem
Existing direct write laser techniques for material deposition and processing, such as LIFT, face limitations due to viscoelastic properties, limiting resolution and printing capabilities, especially when dealing with biological and non-biological materials.
Innovation Solution
A dual beam laser transfer method using a donor and receiver substrate, where a first laser beam ejects materials from the donor to the receiver, followed by a second laser beam for post-processing, enabling high-resolution patterns and functionalization or photopolymerization, with adjustable laser fluences and computer-controlled stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional LIFT technique is used for material transfer, then a wide variety of materials can be transferred, but the viscoelastic properties of the material limit the resolution and printing capabilities
Solution Approach 1:
The laser system is segmented into two independent beams: a first laser beam for material transfer and a second laser beam for post-processing. This segmentation allows each beam to be optimized for its specific function, with the first beam transferring materials at various viscoelastic states and the second beam providing resolution-enhancing post-processing, thereby resolving the contradiction between material versatility and printing resolution
Solution Approach 2:
The first laser beam performs preliminary material transfer action before the second laser beam performs the resolution-enhancing post-processing. This preliminary transfer allows the material to be deposited in a controllable manner, and subsequent post-processing refines the resolution, thus achieving high resolution without being limited by the material's viscoelastic properties during the initial transfer
2Manufacturing precision
If direct write laser techniques are used, then micron and sub-micron resolution can be achieved, but the techniques are limited by the viscoelastic properties of the material
Solution Approach 1:
The invention changes the process parameters by introducing a two-stage laser approach. The first laser beam transfers material with parameters optimized for material ejection and deposition, while the second laser beam performs post-processing with parameters optimized for resolution enhancement. This parameter separation overcomes the limitation where single-parameter optimization cannot simultaneously satisfy both material transfer and high-resolution requirements for materials with varying viscoelastic properties
Solution Approach 2:
The first laser transfer acts as an intermediary step between material source and final high-resolution pattern. It deposits material in a preliminary form that is then refined by the second laser beam. This intermediary transfer process decouples the material deposition function from the resolution-defining function, allowing the system to achieve micron and sub-micron resolution across diverse materials regardless of their viscoelastic properties
3Manufacturing precision
If a single laser beam is used for both transfer and processing, then the process is simpler, but the resolution and functionalization capabilities are limited
Solution Approach 1:
The single laser beam is segmented into two functionally distinct beams: one for material transfer and one for post-processing. This segmentation, while increasing device complexity, enables independent optimization of each function, resulting in superior pattern resolution and functionalization capabilities that cannot be achieved with a single beam. The two-beam configuration allows the transfer beam to focus on material ejection and deposition while the processing beam focuses on resolution enhancement
Solution Approach 2:
The dual beam system provides multi-functionality by combining material transfer and post-processing capabilities in one integrated platform. The first laser beam handles material transfer for various material types, while the second laser beam performs resolution-enhancing post-processing and functionalization. This multi-functional approach achieves high-resolution patterning across diverse materials, making the system universally applicable while maintaining superior performance
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
Achieves high-resolution patterns and efficient functionalization or photopolymerization of materials on substrates, enhancing precision and versatility in microelectronics and bioelectronics applications.
Implementation Method 1
irradiating with a first laser beam of a laser a portion of a back side of the transparent portion to increase the pressure and/or temperature of the absorbing layer
Implementation Method 2
irradiating with a first laser beam of a laser a portion of a back side of the transparent portion to increase the pressure and/or temperature of the absorbing layer to eject a portion of the biological or non-biological material
Implementation Method 3
postprocessing the portion of the biological or non-biological material transferred on the receiver substrate by irradiating with a second laser beam of a laser a portion of the front side of the receiver surface
Data Source
AI summary
Methods and devices for transferring biological or non-biological material coated on a front surface of a donor substrate to a front surface of a receiver substrate. An example of implementation: the front surface of the donor substrate is facing the front surface of the receiver substrate. The donor surface comprises a transparent portion and an absorbing layer on a front side of the transparent portion. A first laser beam of a laser irradiates a portion of a back side of the transparent portion to increase the pressure and/or temperature of the absorbing layer to eject a portion of the biological or non-biological material from the donor substrate and transfer the portion of the material to the receiver surface. The portion of the material transferred on the second substrate is post-processed by irradiating with a second laser beam of a laser a portion of the front side of the receiver surface.