Hybrid Waveguiding Structures With Semiconductor Fins
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Solution Overview
Problem
Existing photonics chips face high propagation losses in silicon waveguides, which are greater than those in silicon nitride waveguides, limiting the efficiency of on-chip communication and sensing.
Innovation Solution
A hybrid waveguiding structure is introduced, featuring semiconductor fins embedded inside the waveguide, which reduces coupling to radiation modes and maintains optical confinement, using a combination of semiconductor materials like single-crystal silicon and dielectric materials such as silicon nitride, zinc oxide, or titanium dioxide for the waveguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If silicon waveguides are used for on-chip communication, then integration with electronic components is improved, but propagation loss increases
Solution Approach 1:
The patent employs a hybrid waveguide structure combining silicon fins (for electronic component compatibility) with silicon nitride cladding (for low optical loss). This composite material approach allows the waveguide to simultaneously achieve low propagation loss characteristics of silicon nitride while maintaining the electronic integration advantages of silicon through the fin structure.
2Loss of energy
If semiconductor fins are added inside the waveguide, then propagation loss is reduced, but device complexity increases
Solution Approach 1:
The waveguide is segmented into distinct functional regions: silicon fins that extend into the waveguide core for optical confinement and low-loss guidance, and silicon nitride cladding that provides the low-loss environment. This segmentation allows each material to perform its optimal function while maintaining manufacturability through standard semiconductor processing techniques.
Solution Approach 2:
The silicon fins are strategically positioned only in specific regions where optical confinement is needed, rather than throughout the entire waveguide. This local application of semiconductor material optimizes the balance between optical performance and manufacturing complexity, allowing standard CMOS processes to be used while achieving superior optical characteristics.
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 hybrid waveguiding structure reduces propagation loss while maintaining optical confinement, improving signal routing efficiency and compatibility with CMOS technology for integrated photonics chips.
Implementation Method 1
Optical signals propagate as electromagnetic waves within waveguides using a number of different modes characterized by different properties
Data Source
AI summary
Waveguiding structures and methods of fabricating a waveguiding structure. The waveguiding structure includes a waveguide and an array of semiconductor fins that are arranged at least in part inside the waveguide.