Photonic Waveguide Structure Using High-k Material for Gap-Tolerant Coupling
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Solution Overview
Problem
The integration of multi-layer waveguides in silicon photonic devices is hindered by the difficulty in controlling the nano-scale gap between them, leading to decreased coupling efficiency and increased insertion loss.
Innovation Solution
Incorporating high-dielectric constant materials between waveguide layers to increase gap tolerance and reduce the need for precise nano-scale gap control, thereby enhancing coupling efficiency and reducing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-layer waveguides are integrated on a wafer for light transfer, then light transfer capability is improved, but coupling efficiency decreases due to difficulty in controlling nano-scale gap
Solution Approach 1:
The patent introduces an intermediary material layer between the waveguide layers to mediate the optical coupling. This intermediate layer facilitates light transfer between layers while eliminating the need for precise nano-scale gap control, thus resolving the contradiction between integrated light transfer capability and coupling efficiency
Solution Approach 2:
The patent changes the structural parameters of the waveguide system by introducing an additional material layer with specific optical properties. This parameter change allows for relaxed gap tolerances while maintaining effective optical coupling between layers
2Reliability
If nano-scale gap control is implemented between waveguide layers, then coupling efficiency is improved, but manufacturing difficulty increases
Solution Approach 1:
By introducing an intermediary material layer, the patent eliminates the need for precise nano-scale gap control during manufacturing. The intermediary layer absorbs dimensional variations and maintains effective optical coupling, significantly reducing manufacturing difficulty while preserving coupling efficiency
Solution Approach 2:
The patent segments the gap region into a structured intermediate layer with defined optical properties, rather than relying on precise control of the void space. This segmentation approach simplifies manufacturing by providing a tangible material structure that can be deposited using standard fabrication processes
3Reliability
If precise nano-scale gap control is used between waveguide layers, then coupling efficiency is improved, but insertion loss increases
Solution Approach 1:
The intermediary material layer acts as an optical mediator that reduces insertion loss by providing a controlled refractive index transition between waveguide layers. This eliminates energy loss associated with uncontrolled gap variations while maintaining coupling efficiency
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 high-dielectric constant materials improves coupling efficiency and reduces transfer length between waveguide layers, minimizing the need for precise nano-scale gap control during manufacturing.
Implementation Method 1
a high-dielectric constant material is disposed between the first waveguide layer and the second waveguide layer
Data Source
AI summary
A photonic structure and a method for manufacturing the same are provided. The photonic structure includes a substrate, an insulating structure, a first waveguide layer, a second waveguide layer and a high-dielectric constant material. The insulating structure is located over the substrate. The first waveguide layer is embedded in the insulating structure. The second waveguide layer is embedded in the insulating structure and longitudinally spaced apart from the first waveguide layer. The high-dielectric constant material is disposed between the first waveguide layer and the second waveguide layer.