Wafer-Scale Optical Spacer Fabrication via Single-Step Replication
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Solution Overview
Problem
Current wafer-scale manufacturing processes for integrated optical devices lack efficiency and flexibility in producing spacer and optics structures, particularly in aligning and replicating different materials for optical elements and spacer elements.
Innovation Solution
A method of fabricating a wafer-scale spacer/optics structure using a single replication tool that directly replicates optical and spacer elements onto an optics wafer, allowing for the use of different materials and reducing the need for large masters and alignment steps, by embossing and curing replication materials with UV or thermal curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional multi-step replication processes are used with large masters, then alignment precision can be maintained, but manufacturing complexity and time increase significantly
Solution Approach 1:
The patent combines multiple replication steps into a single wafer-scale replication process. The master template contains both optical element patterns and spacer element patterns, allowing both to be replicated simultaneously in one step, eliminating the need for separate alignment and replication steps for different components.
Solution Approach 2:
The replication tool is designed to perform multiple functions: it can replicate both optical elements and spacer elements, and can work with different materials (photoresist and non-photoresist materials) using the same tool and process flow, reducing the need for specialized equipment for each step.
2Adaptability or versatility
If multiple materials are used for optical and spacer elements, then functional performance improves, but alignment and replication difficulty increases
Solution Approach 1:
The master template is designed with spatially distinct regions: optical element regions and spacer element regions. This allows different materials to be applied to different regions according to their specific requirements, while the overall replication process remains unified and aligned through the single template structure.
Solution Approach 2:
The master template is prepared in advance with all necessary alignment features and patterns for both optical and spacer elements. This preliminary preparation ensures that when replication occurs, all elements are already positioned correctly relative to each other, eliminating the need for complex real-time alignment during the replication process.
3Productivity
If wafer-scale replication is used, then productivity increases, but control over shrinkage and expansion becomes more difficult
Solution Approach 1:
The patent employs UV or thermal curing to control the replication process. By carefully controlling the curing parameters (UV exposure time and intensity, or thermal curing temperature and duration), the process maintains dimensional accuracy across the entire wafer scale while achieving high throughput replication of multiple elements.
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 method enables efficient and flexible production of wafer-scale spacer/optics structures with reduced material usage and alignment requirements, allowing for the creation of high-quality optical elements and spacers with minimal visible bond lines and reduced shrinkage or expansion issues, suitable for integration into opto-electronic devices.
Implementation Method 1
The replicated optical elements and spacer elements can be made of the same or different materials and may be cured, for example, by UV or thermal curing
Implementation Method 2
The replicated optical elements and spacer elements can be made of the same or different materials and may be cured, for example, by UV or thermal curing
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Fabricating a wafer-scale spacer/optics structure includes replicating optical replication elements and spacer replication sections directly onto an optics wafer (or other wafer) using a single replication tool. The replicated optical elements and spacer elements can be composed of the same or different materials.