Inhibition Blocks in Poled Ferroelectric Substrates

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing poled structures in ferroelectric single crystals, such as lithium niobate and lithium tantalite, face issues with over-poling, where the polarization domains merge excessively, leading to non-uniformity and potential device failure in optical applications.

Innovation Solution

Incorporating inhibition blocks with a different crystal structure into the ferroelectric substrate, these blocks are strategically positioned between electrodes and are resistant to polarization reversal, preventing the merging of inverted domains and ensuring uniform, deeper periodic domain formation through a controlled poling process with specific voltage applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If electric voltage is applied to form polarization inversion parts in ferroelectric substrate, then inverted domains are created for optical applications, but over-poling occurs causing domains to merge excessively leading to non-uniformity

Engineering Contradiction:

Improveuniformity of inverted domainsVSAvoiddomain merging control

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent introduces inhibition blocks that segment the continuous ferroelectric substrate into distinct regions. These blocks act as physical barriers that prevent the merging of inverted domains, thereby maintaining domain uniformity and preventing over-poling effects.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inhibition blocks create local regions with different crystal structures within the ferroelectric substrate. These localized areas have distinct properties that resist polarization reversal, allowing controlled poling in specific regions while preventing unwanted domain merging elsewhere.

Inventive Principle:

Principle #3Local quality

2Strength

If deeper periodic domain formation is achieved through poling, then optical performance is enhanced, but domain merging and leakage occur reducing structural integrity

Engineering Contradiction:

Improvestructural integrityVSAvoiddomain formation control

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The inhibition blocks serve as intermediary structures between the electrodes and the ferroelectric substrate. These blocks mediate the poling process by allowing controlled electric field penetration while preventing excessive domain inversion and merging, thus maintaining structural integrity during deep domain formation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The inhibition blocks are pre-positioned in the substrate to counteract the potential harmful effect of over-poling before it occurs. They provide preliminary resistance to polarization reversal, preventing domain merging and leakage that would otherwise compromise structural integrity during the poling process.

Inventive Principle:

Principle #9Preliminary anti-action

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 solution effectively inhibits over-poling, ensuring uniform and deeper inverted domain formation, enhancing the structural integrity and performance of poled structures in optical applications by preventing domain merging and leakage.

Implementation Method 1

the inhibition block has a second crystal structure different from the first crystal structure... the inhibition block... is resistant to polarization reversal

Methodology Applied

Scientific EffectFerroelectric domain inversion resistance:

Implementation Method 2

an electrode structure including a first electrode and a second electrode on the top surface and a third electrode in a portion of the bottom surface... inverted domains has a second polarization direction substantially opposite to the first polarization direction

Methodology Applied

Scientific EffectElectric field-induced polarization reversal: Electric Field

Data Source

PatentUS7428097B1Poled structure with inhibition blocks

Publication Date: 2008.09.23 HC PHOTONICS

AI summary

A poled structure comprises a ferroelectric substrate having a top surface and a bottom surface, at least one inhibition block positioned in the ferroelectric substrate, an electrode structure including a first electrode and a second electrode on the top surface and a third electrode in a portion of the bottom surface between the first electrode and the second electrode and a plurality of inverted domains positioned outside of the inhibition block in the ferroelectric substrate. The ferroelectric substrate has a first polarization direction and a first crystal structure, the inhibition block has a second crystal structure different from the first crystal structure, and the inverted domains has a second polarization direction substantially opposite to the first polarization direction.