Waveguide Dielectric Structure to Prevent Substrate Signal Leakage
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Solution Overview
Problem
Semiconductor devices face challenges in preventing optical signal leakage into the substrate during fabrication, particularly due to misalignment caused by structural support issues with dielectric structures, which affects the efficiency of optical communication and propagation.
Innovation Solution
The semiconductor device incorporates a waveguide over a substrate with a first dielectric structure and a second dielectric structure under the waveguide, where the second dielectric structure inhibits the removal of a substrate portion, creating a void that prevents signal leakage and provides structural support to maintain alignment with optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the substrate is removed to improve optical signal transfer efficiency, then signal leakage is prevented, but structural support is lost causing misalignment
Solution Approach 1:
The substrate is segmented into two distinct portions: a first substrate portion that remains to provide structural support and maintain alignment, and a second substrate portion that is removed to create the void and prevent optical signal leakage. This segmentation allows the device to simultaneously achieve both structural stability and optimal optical performance.
Solution Approach 2:
The second substrate portion is extracted or removed from the structure to create a void space. This extraction eliminates the medium that would cause optical signal leakage while preserving the first substrate portion that provides necessary structural support. The removed portion is selectively eliminated through etching processes.
2Reliability
If a void is created to prevent optical signal leakage, then signal transfer efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The dielectric structures are formed and positioned on the substrate before the selective removal of the second substrate portion. This preliminary action ensures that the void is created in the correct location and that the remaining first substrate portion is properly positioned to provide structural support, thereby simplifying the overall manufacturing process.
Solution Approach 2:
Dielectric structures serve as intermediaries that facilitate the creation of the void and the selective removal process. These structures are used to define the boundaries of the void and to protect the first substrate portion during the removal process, making the manufacturing of the complex void structure more manageable.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes a waveguide over a substrate. The semiconductor device includes a first dielectric structure over the substrate, wherein a portion of the waveguide is in the first dielectric structure. The semiconductor device includes a second dielectric structure under the waveguide, wherein a first sidewall of the second dielectric structure is adjacent a first sidewall of the substrate.