Periodic Poling Structure With Tunnel-Based Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for preparing periodic poling structures, such as those for quasi-phase matching, often require multiple voltage applications or complex processes, which can be inefficient and lack precise control over domain formation.
Innovation Solution
A method involving the formation of tunnels and conductive blocks on a ferroelectric substrate, with a predetermined voltage applied to create alternating domains, using conductive protrusions and blocks to achieve precise polarization inversion, allowing for efficient and controlled domain formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple voltage applications are used to form polarization inversion parts, then polarization inversion can be achieved, but the preparation process becomes complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by forming tunnels and conductive blocks before applying voltage. The tunnels are pre-formed with specific dimensions and positions, and conductive blocks are pre-positioned at the tunnel bottoms. This preliminary structure preparation enables the voltage application to directly create the desired polarization inversion without requiring multiple complex voltage application steps, thus simplifying the overall process while ensuring reliable polarization inversion.
2Reliability
If conventional methods are used to form periodic poling structures, then polarization inversion can be achieved, but precise control over domain widths and polarization directions is difficult
Solution Approach 1:
The patent applies local quality by creating tunnels with specific dimensions at specific locations, and positioning conductive blocks with precise dimensions at the bottom of each tunnel. The tunnel width, depth, and spacing are carefully controlled to determine the exact width and position of the resulting polarization domains. This localized structural control enables precise manipulation of domain characteristics while maintaining reliable polarization inversion throughout the structure.
3Reliability
If multiple processing steps are used to prepare periodic poling structures, then polarization inversion can be achieved, but productivity is reduced
Solution Approach 1:
The patent merges multiple functions into the tunnel and conductive block structure. The tunnels serve as both structural features for domain definition and as conduits for voltage application. The conductive blocks simultaneously provide electrical connection and serve as the actual voltage application points. This merging of functions reduces the number of separate processing steps required, thereby improving productivity while maintaining reliable polarization inversion.
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 method enables the creation of periodic poling structures with precise control over domain widths and polarization directions, enhancing quasi-phase matching capabilities and simplifying the preparation process.
Implementation Method 1
applying a predetermined voltage to the conductive blocks in the tunnels such that a plurality of first domains having a first polarization direction are formed in the ferroelectric substrate between the tunnels and a plurality of second domains interleaved between the first domains are formed in the ferroelectric substrate
Data Source
AI summary
A periodic poling structure comprises a ferroelectric substrate including a plurality of tunnels, a plurality of first domains positioned in the ferroelectric substrate between the tunnels and a plurality of second domains interleaved between the first domains in the ferroelectric substrate. Each first domain has a first polarization direction, and each second domain has a second polarization direction different from the first polarization direction. The tunnels are disposed on a top surface and on a bottom surface of the ferroelectric substrate in an equal interval manner or in a variant interval manner. Particularly, the second polarization direction is opposite to the first polarization direction. The periodic poling structure further comprises a plurality of conductive blocks covering the entire base surfaces of the tunnels, or separated from the sidewalls of the tunnels by insulation gaps such that the conductive blocks cover only a portion of the base surfaces of the tunnels.