Photonic Transmission Structure for Low-Temperature 3D PIC Stacking
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Solution Overview
Problem
Conventional deposition processes for forming optical structures in photonic integrated circuits (PICs) at high temperatures can damage existing layers, preventing the creation of robust, three-dimensional PICs with vertically stacked structures.
Innovation Solution
Employing a sputtering process with low operating temperatures to form photonic transmission structures using non-alkali oxide solutions containing niobium, allowing for the formation of active structures that maintain refractive indices similar to silicon nitride while minimizing optical loss and structural damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition processes are used to form optical structures at high temperatures, then the refractive index and optical properties can be controlled, but existing layers are damaged and structural integrity is compromised
Solution Approach 1:
The patent changes the temperature parameter from high temperature (conventional deposition) to low temperature (sputtering process), thereby maintaining structural integrity while still achieving the desired optical properties through the specific sputtering methodology and non-alkali oxide material composition
Solution Approach 2:
The patent replaces the conventional deposition process with a sputtering process, substituting one physical mechanism for another. The sputtering process uses physical vapor deposition rather than chemical vapor deposition, allowing low-temperature processing that preserves existing layers while forming new optical structures
2Manufacturing precision
If high temperature deposition is used to form optical layers, then optical properties can be achieved, but vertically stacked three-dimensional structures cannot be created
Solution Approach 1:
The patent enables vertical stacking by transitioning from planar to three-dimensional structures. The low-temperature sputtering process allows multiple layers to be deposited vertically one on top of another without thermal damage, creating robust three-dimensional photonic integrated circuits with stacked waveguides and optical components
Solution Approach 2:
By changing the temperature parameter to low temperature, the patent enables the formation of multiple stacked layers that would be impossible with high-temperature processes, thereby achieving complex three-dimensional architectures
3Ease of manufacture
If conventional deposition processes are used, then processing can be performed, but existing layers are damaged and further processing is prevented
Solution Approach 1:
The low-temperature sputtering process enables continuous processing without damaging existing layers, allowing multiple layers to be formed in sequence. The process can be repeated multiple times to build up complex stacked structures, maintaining continuity of manufacturing action
Solution Approach 2:
The patent performs preliminary actions by forming each layer carefully using low-temperature sputtering before adding the next layer. This preliminary formation of stable, non-damaging layers enables subsequent processing steps to proceed without risk of damage
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
Enables the construction of reliable, three-dimensional optical devices with vertically stacked structures by reducing the likelihood of damaging existing layers and ensuring uniform thicknesses, thereby improving performance and reliability.
Implementation Method 1
Each of the first active structure and the second active structure includes a non-alkali oxide material. The first active structure is formed using a first sputtering process, the second active structure is formed using a second sputtering process
Data Source
AI summary
In some implementations, a photonic transmission structure includes a first cladding structure; a first active structure disposed over the first cladding structure; and a second cladding structure disposed over the first active structure. The first active structure includes a non-alkali, oxide solution that includes a cation that is niobium.