ZnO Optical Waveguides for Low-Loss Silicon Interconnects
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Solution Overview
Problem
Current semiconductor technologies face challenges in forming efficient electrical connections between circuit devices on the same or different wafers and in packaging integrated circuitry, with existing optical waveguides and fibers experiencing signal loss and absorption issues due to material properties and wavelength compatibility.
Innovation Solution
The use of Zinc Oxide (ZnO) optical waveguides embedded in silicon oxide on silicon wafers, which operate by transmitting optical signals with wavelengths less than the ZnO bandgap to avoid absorption, and can be doped to match compatibility with emitters and detectors, utilizing deposition techniques like Hybrid Beam Deposition, Metal Organic Chemical Vapor Deposition, and Atomic Layer Deposition for low-loss signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional optical waveguides or fibers are used for signal interconnection, then signal transmission between circuits is achieved, but signal loss and absorption occur due to material properties and wavelength compatibility issues
Solution Approach 1:
The patent changes the material parameter of the waveguide core from conventional materials to zinc oxide (ZnO), which has a wide bandgap that prevents absorption of UV and blue light wavelengths. This parameter change in material composition directly reduces signal loss while maintaining reliable transmission for specific wavelength ranges.
Solution Approach 2:
The patent employs a composite structure with ZnO as the core material and silicon oxide as the cladding material. This composite material approach leverages the complementary properties of each material - ZnO's wide bandgap for low absorption loss and silicon oxide's suitable refractive index for effective waveguiding - to achieve both low loss and high reliability.
2Adaptability or versatility
If ZnO is used as the waveguide material to reduce absorption, then compatibility with silicon detectors is maintained, but additional doping steps are required to match emitter and detector compatibility
Solution Approach 1:
The patent applies local quality by performing selective doping of ZnO at specific locations and depths within the waveguide structure. Different regions of the ZnO layer receive different dopant concentrations tailored to local requirements - such as enhancing UV emission at the emitter interface or improving detector coupling at the output interface - thereby achieving comprehensive compatibility without uniformly complicating the entire structure.
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 low-loss optical signal interconnections with reduced absorption, allowing for efficient transmission of signals between integrated circuits while maintaining compatibility with silicon detectors, offering improved design latitude for waveguide-based integrated circuits.
Implementation Method 1
transmitting optical signals with wavelengths less than the ZnO bandgap to avoid absorption
Implementation Method 2
Wave guiding is provided by total internal reflection at the interface between the higher index of refraction core and the lower index of refraction of the material in which the guide is embedded
Implementation Method 3
deposition techniques like Hybrid Beam Deposition, Metal Organic Chemical Vapor Deposition, and Atomic Layer Deposition
Data Source
AI summary
The present disclosure includes methods, devices, and systems having zinc oxide waveguides for optical signal interconnections. One optical signal interconnect system includes an oxide layer on a semiconductor substrate. A ZnO waveguide can be provided in the oxide layer and connected to a silicon detector to receive optical signals having a wavelength, for example, between 500 and 375 nanometers (nm).