Trench-Based Waveguide Core Integration for Photonics Chips
Solution Overview
Problem
Existing photonics chips face challenges in integrating waveguide cores with electronic components due to etching processes that can adversely impact the electronic components, particularly due to inadequate masking, leading to potential damage and inefficiencies in layout and operational overhead.
Innovation Solution
A structure and method involving a dielectric layer with a trench that houses a waveguide core, where the trench's width is greater than the waveguide core's width, providing protection to electronic components during etching and promoting efficient coupling between waveguide cores while minimizing damage, using a heterogeneous multilayer stack and etch masks to control etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveguide cores are formed after electronic components using etching processes, then optical components can be integrated into the photonics chip, but the electronic components may be adversely impacted due to inadequate masking
Solution Approach 1:
The patent divides the waveguide core formation process into two distinct stages: first forming a trench structure that provides physical protection to electronic components, then forming the waveguide core within the trench. This segmentation allows the etching process to be contained within the trench boundaries, preventing damage to underlying electronic components while still enabling optical component integration.
Solution Approach 2:
The trench is formed as a preliminary structure before the waveguide core is created. This preliminary action establishes a protected environment that shields electronic components from subsequent etching processes, allowing the waveguide core to be formed safely within the predetermined trench boundaries.
2Object-affected harmful factors
If the trench width is greater than the waveguide core width, then electronic components are protected during etching, but the layout area increases
Solution Approach 1:
The trench provides localized protection only in the specific regions where electronic components are located, rather than requiring universal protection across the entire chip. The trench width is optimized to provide adequate protection margin only where needed, minimizing overall layout area while maintaining component safety.
Data Source
AI summary
Structures including a waveguide core and methods of fabricating a structure that includes a waveguide core. A dielectric layer including a trench with a first sidewall and a second sidewall, and a waveguide core positioned inside the trench between the first and second sidewalls of the trench. The waveguide core has a first width, and the trench has a second width between the first and second sidewalls that is greater than the first width.