Wafer Alignment Features for Micron-Scale Laser Writing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microfabrication and laser writing processes for device manufacturing often require separate tools and locations, making spatial alignment of microfabricated and laser-written patterns challenging, especially at the micron scale, which is critical for the proper functioning of devices like ion traps.
Innovation Solution
The proposed solution involves preparing a wafer with alignment features of known relative locations and orientations, aligning both microfabrication and laser writing processes to these features, and then processing the wafer using these aligned processes. This method ensures accurate spatial alignment between microfabricated and laser-written patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate tools and locations are used for microfabrication and laser writing processes, then process independence and flexibility are improved, but spatial alignment precision between microfabricated and laser-written patterns deteriorates
Solution Approach 1:
The patent introduces alignment marks as intermediary features that serve both microfabrication and laser writing processes. These marks are created during microfabrication and then used as reference points for laser writing alignment, enabling precise spatial coordination between the two independent processes without requiring direct integration of the tools or locations.
2Manufacturing precision
If alignment features are created with known relative locations and orientations, then spatial alignment between processes is improved, but process complexity increases
Solution Approach 1:
The patent implements preliminary creation of alignment marks during the microfabrication process before laser writing begins. By pre-establishing these reference features with known geometries and positions, the system eliminates the need for complex real-time alignment calculations and measurements during laser writing, thereby reducing overall process complexity while maintaining high spatial alignment precision.
Data Source
AI summary
Aspects of the present disclosure may include a method and/or a system for spatially aligning microfabrication processes and laser writing processes on a wafer by preparing a pattern of alignment features across a wafer with known relative locations and orientations between elements of the pattern, aligning one or more laser writing processes to the alignment patterns, laser writing features into the wafer based on the prior process alignment, aligning one or more microfabrication processes to the microfabrication alignment patterns, and processing the wafer via the microfabrication steps using the results of the prior alignment step.