Ion Beam Grating Formation for Multi-Profile Waveguides
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Solution Overview
Problem
The manufacturing of waveguides with different material properties on the same substrate is a time-consuming process, as existing photolithography methods require multiple mask steps and lack the capability to create varying grating profiles and spacings.
Innovation Solution
A method involving the deposition of a resist material on a grating material, patterning it into a resist layer, and projecting ion beams with specific angles and profiles to form gratings with desired profiles, allowing for more accurate and efficient formation of grating regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photolithography methods are used to manufacture waveguides with different material properties, then waveguides can be formed on the same substrate, but the process becomes time-consuming due to multiple mask steps
Solution Approach 1:
The patent divides the substrate into multiple device areas, each with its own resist layer and grating profile. This allows different waveguide structures to be formed simultaneously in different regions without requiring sequential mask steps across the entire substrate, thereby reducing overall manufacturing time while maintaining the capability to produce diverse waveguide types.
Solution Approach 2:
The patent applies different grating profiles and spacing to different device areas on the same substrate. Each area can be optimized for specific waveguide requirements (e.g., different materials, wavelengths, or propagation characteristics) while the overall process remains efficient and time-effective through parallel processing capabilities.
2Ease of manufacture
If conventional photolithography methods are used, then waveguides can be manufactured, but varying spacing and profiles of gratings in different waveguides cannot be achieved
Solution Approach 1:
The patent implements local quality by assigning different grating profiles, spacing, and geometries to different device areas on the same substrate. Each area can be independently optimized for specific waveguide requirements while maintaining a unified manufacturing process, thereby achieving both ease of manufacture and design versatility.
Solution Approach 2:
The patent introduces an additional degree of freedom by varying grating parameters (spacing, profile, orientation) across different spatial dimensions on the substrate. This allows complex waveguide structures with diverse characteristics to be created within a single manufacturing pass, enhancing adaptability without complicating the manufacturing process.
3Adaptability or versatility
If multiple mask steps are used in photolithography, then waveguides with different material properties can be formed, but the process complexity increases
Solution Approach 1:
The patent segments the substrate into multiple device areas, each with independently optimized resist layers and grating profiles. This segmentation allows different waveguide types to be formed in parallel during a single manufacturing process, achieving material property diversity without requiring multiple sequential mask steps, thereby reducing process complexity.
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 the formation of gratings with varying profiles and angles, improving the efficiency of waveguide manufacturing by simplifying the process and enhancing the capability to create complex grating structures.
Implementation Method 1
projecting a first ion beam to the first device area for a first period of time to form a first plurality of gratings in the grating material, and projecting a second ion beam to the second device area for a second period of time to form a second plurality of gratings in the grating material
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
Embodiments of the disclosure generally relate to methods of forming gratings. The method includes depositing a resist material on a grating material disposed over a substrate, patterning the resist material into a resist layer, projecting a first ion beam to the first device area to form a first plurality of gratings, and projecting a second ion beam to the second device area to form a second plurality of gratings. Using a patterned resist layer allows for projecting an ion beam over a large area, which is often easier than focusing the ion beam in a specific area.