Silicon Photonic Platform Signal Layer Etching Depth Control
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Solution Overview
Problem
Current CMOS manufacturing methods for silicon photonic platforms face challenges in achieving high precision due to large fluctuations in etching depth, which is insufficient for the precise dimensional requirements of waveguide structures.
Innovation Solution
The use of a signal layer to control the accuracy of the etching depth in the manufacturing process of silicon photonic platforms, allowing for higher precision and reduced geometric size errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching stop layer is used, then manufacturing process is simple, but etching depth accuracy is insufficient (fluctuation about 30 nanometers)
Solution Approach 1:
The patent introduces a signal layer as an intermediary between the photonic platform layer and the etching stop layer. This signal layer generates detectable signals during the etching process, enabling real-time monitoring and precise control of etching depth. The signal layer acts as a mediator that translates the physical etching process into measurable signals, thereby achieving high precision etching depth control without overly complicating the overall manufacturing process.
Solution Approach 2:
The patent implements a feedback mechanism by detecting signals from the signal layer during the etching process. The detection system monitors the etching depth in real-time based on the signals generated by the signal layer, and adjusts the etching process accordingly to achieve the desired precision. This feedback loop enables the system to maintain high etching depth accuracy by continuously comparing actual etching depth with target depth and making necessary corrections.
2Manufacturing precision
If signal layer is introduced to control etching depth accuracy, then etching depth precision is improved, but platform structure becomes more complex
Solution Approach 1:
The patent merges the signal layer with the photonic platform layer by forming the signal layer on top of the photonic platform layer. This integration approach allows the signal layer to serve dual purposes: it provides etching depth control signals while also being part of the overall photonic platform structure. By merging these functions into a single integrated structure, the patent reduces the need for separate, additional components that would otherwise increase device complexity.
3Manufacturing precision
If higher etching depth accuracy is achieved, then geometric size error is reduced, but manufacturing process complexity increases
Solution Approach 1:
The signal layer performs self-service by automatically generating detectable signals during the etching process that indicate the etching depth status. This self-generating signal mechanism eliminates the need for complex external measurement and control systems, as the structure itself provides the necessary feedback information. The signal layer essentially monitors and reports its own state, simplifying the overall manufacturing process while maintaining high precision.
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 approach enables higher accuracy in etching depth, reducing geometric size errors and enhancing the application of silicon photonic platforms in waveguides for directional guidance of electromagnetic waves.
Implementation Method 1
A photonic platform spectral signal of the photonic platform material is different from a first spectral signal of the first signal material
Data Source
AI summary
A silicon photonic platform includes a composite substrate with a first photonic platform layer which includes a photonic platform material. A first signal layer covers the first photonic platform layer, has a top surface, and includes the photonic platform material and a first signal material. A photonic platform spectral signal is different from the first signal material spectral signal. The second photonic platform layer has a top surface, covers at least a portion of the top surface of the first signal, and includes the photonic platform material. The second photonic platform layer includes at least one ridge structure, and forms a silicon photonic platform together with the first photonic platform layer.