Hybrid MOS Capacitor Optical Waveguide Resonator
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Solution Overview
Problem
Silicon-based semiconductor materials are inefficient for optical communications due to limited light generation and data modulation efficiency, as well as slow carrier diffusion rates, making them unsuitable for complex optical communications systems.
Innovation Solution
Integration of a metal-oxide-semiconductor (MOS) capacitor structure within an optical waveguide resonator using direct-bandgap III-V compound semiconductor layers with a silicon layer, enabling low-power consumption, high-speed loss phase modulation, and tuning through a dielectric layer sandwiched between the semiconductor layers, leveraging the strong plasma dispersion electro-optic effect and advanced CMOS fabrication techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicon-based semiconductor materials are used for optical communications, then manufacturing complexity is reduced and fabrication is simplified, but light generation efficiency and data modulation efficiency deteriorate
Solution Approach 1:
The patent employs a hybrid structure combining silicon waveguide layers with III-V compound semiconductor layers (such as InGaAsP). The silicon layer provides excellent waveguiding properties and CMOS compatibility, while the III-V layer contributes high refractive index and efficient light generation through direct bandgap properties. This composite material approach allows the device to leverage the advantages of both material systems, achieving both ease of manufacture and high light generation efficiency.
2Ease of manufacture
If silicon-based semiconductor materials are used for optical communications, then manufacturing complexity is reduced, but data modulation efficiency and carrier diffusion rate deteriorate
Solution Approach 1:
The hybrid silicon-III-V structure enables efficient data modulation by combining silicon's CMOS-compatible fabrication with III-V's superior carrier dynamics. The III-V active region provides fast carrier diffusion and efficient modulation, while the silicon waveguide maintains manufacturing simplicity through standard CMOS processes.
3Device complexity
If complex optical communications systems are implemented using silicon-based materials, then system integration is simplified, but overall system performance deteriorates due to material limitations
Solution Approach 1:
The patent implements a vertically integrated hybrid structure where silicon waveguide layers are combined with III-V active regions. This approach maintains relatively simple system integration through wafer-level bonding and standard semiconductor fabrication, while dramatically improving optical communication performance through the complementary properties of both material systems.
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 high-speed modulation with minimal power consumption, flexibility in material choice and processing methods, and efficient manufacturing of hybrid devices like lasers and modulators, enhancing optical communication efficiencies by utilizing the strengths of both silicon and III-V semiconductor materials.
Implementation Method 1
leveraging the strong plasma dispersion electro-optic effect
Data Source
AI summary
An example device in accordance with an aspect of the present disclosure includes a first semiconductor layer disposed on a substrate, a dielectric layer disposed between the first semiconductor layer and a second semiconductor layer dissimilar from the first semiconductor layer. A capacitor is formed of at least a portion of the first semiconductor layer, the dielectric layer, and the second semiconductor layer, and is to be included in an optical waveguide resonator.