Seeded Structured Coatings for Multi-Level Optical Thickness Control
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Solution Overview
Problem
Manufacturing structured coatings with complex and varied optical functionalities is challenging due to the complexity, time-consumption, and expense of existing fabrication processes, particularly for multi-level structures.
Innovation Solution
Employing seed structures on a substrate surface, where the respective heights of these structures define local thicknesses of the coating, allowing for the deposition of coatings using surface growth techniques such as ALD or CVD, which form structured coatings with varying thicknesses and profiles, reducing fabrication complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing fabrication processes are used to manufacture structured coatings with complex and varied optical functionalities, then the optical performance and device efficiency are improved, but the manufacturing complexity, time-consumption, and expense increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-forming seed structures with specific height variations on the substrate surface before coating deposition. These pre-formed seeds serve as templates that automatically define the future coating thickness distribution, eliminating the need for complex post-coating structuring steps and reducing overall manufacturing complexity while maintaining optical performance
Solution Approach 2:
The patent introduces seed structures as intermediary elements that mediate between the flat substrate and the final structured coating. These seeds act as temporary scaffolds during deposition, enabling precise thickness control without requiring complex direct coating processes, thus simplifying manufacturing while achieving the desired optical functionalities
2Adaptability or versatility
If multi-level structured coatings are fabricated using conventional methods, then the coating complexity and optical functionality are improved, but the fabrication time and cost increase
Solution Approach 1:
The method performs preliminary structuring by forming seeds with varying heights before coating deposition. This pre-structuring enables the coating process to directly produce multi-level structures in a single deposition step, dramatically reducing fabrication time compared to conventional sequential layering methods while maintaining high coating complexity and versatility
Solution Approach 2:
The patent transitions from planar 2D coating patterns to 3D multi-level structures by introducing vertical height variation through seeded nucleation. This dimensional approach allows complex multi-level coatings to be formed in a single deposition process rather than requiring multiple sequential steps, thereby increasing productivity without sacrificing structural complexity
3Ease of manufacture
If seed structures are used to define local coating thicknesses, then the manufacturing complexity and cost are reduced, but additional steps for seed formation and potential removal are required
Solution Approach 1:
The patent applies the extraction principle by removing the seeds from the final structure after they have served their templating function during coating deposition. This eliminates the need for complex integrated seed structures in the final product, simplifying the end-device while maintaining the manufacturing simplicity benefits during the fabrication process
Solution Approach 2:
The method employs discarding and recovering by temporarily introducing seeds to control coating thickness, using them during the deposition process, then removing and discarding them after they have fulfilled their templating purpose. This approach maintains manufacturing simplicity during the critical coating formation step while avoiding complexity in the final device structure
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 use of seed structures enables the fabrication of highly complex and varied structured coatings with reduced manufacturing complexity and cost, while allowing for the incorporation of high refractive index materials, enhancing optical performance and device efficiency.
Implementation Method 1
The coating is deposited using atomic layer deposition or chemical vapor deposition
Implementation Method 2
The coating is deposited using atomic layer deposition or chemical vapor deposition
Implementation Method 3
Providing the coating includes depositing the coating using a surface growth technique, and the coating is grown at least in part from surfaces of the plurality of seed structures
Data Source
AI summary
A method includes providing a coating over a surface of a substrate, a plurality of seed structures being disposed on the surface of the substrate, in which respective heights of the seed structures define local thicknesses of the coating. An optical device includes a substrate, a plurality of seed structures on a surface of the substrate, and a coating on the seed structures and on the surface of the substrate, in which respective heights of the seed structures define local thicknesses of the coating.