Periodic Polarization Inversion Structures in Ferroelectric Substrates

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Solution Overview

Problem

Existing methods for forming periodic polarization inversion structures in ferroelectric crystal substrates face challenges in increasing density while preventing breakdown and maintaining optical output performance, as reducing the period of electrode piece part-arrays leads to voltage breakdown and current leakage, limiting the productivity of these structures.

Innovation Solution

The method involves forming first and second electrode piece part-arrays on a ferroelectric crystal substrate, applying voltage to create separate groups of periodic polarization inversion structures, and strategically spacing the ends of these structures to prevent breakdown, allowing for a smaller period without defects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the period of electrode piece part-arrays is reduced to increase density, then productivity is improved, but voltage breakdown and current leakage occur

Engineering Contradiction:

Improveproductivity of periodic polarization inversion structuresVSAvoidvoltage breakdown prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention divides the electrode structure into multiple independent electrode piece parts arranged in arrays with spaces between them. This segmentation allows the electrode array to be divided into multiple independent voltage application regions, enabling dense packing while preventing voltage breakdown between adjacent structures through the insulating spaces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces an insulating film as an intermediary layer between adjacent electrode piece parts. This intermediary prevents direct electrical contact and voltage breakdown between densely packed electrode structures, allowing the period to be reduced without sacrificing reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the interval between devices is reduced to increase the number of devices per wafer, then mass-production is improved, but stable production becomes uncertain due to changed formation conditions

Engineering Contradiction:

Improvenumber of devices per waferVSAvoidstable production

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

By segmenting the electrode structure into standardized electrode piece parts with defined geometries and spacing, the invention creates repeatable formation conditions that can be consistently applied across multiple devices on a single wafer, ensuring stable production.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention establishes specific parameter ranges for electrode piece part dimensions, spacing, and array configuration that optimize both device density and formation stability. These controlled parameter changes enable increased devices per wafer while maintaining consistent production quality.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the length of the device is made smaller to increase the number of devices, then productivity is improved, but conversion efficiency is considerably lowered

Engineering Contradiction:

Improvenumber of devices per waferVSAvoidconversion efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The invention compensates for reduced device length by optimizing the two-dimensional arrangement of electrode piece parts within the available wafer area. By carefully controlling the period and spacing in the lateral dimensions, multiple devices can be packed per wafer while each device maintains sufficient interaction length for adequate conversion efficiency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 the formation of densely packed periodic polarization inversion structures with reduced period and prevents breakdown, thereby improving productivity and maintaining optical output performance.

Implementation Method 1

a voltage is applied between them to form periodic polarization inversion structures in the substrate

Methodology Applied

Scientific EffectPolarization inversion: Polarisation

Data Source

PatentUS11332849B2Method of producing periodic polarization inversion structures

Publication Date: 2022.05.17 NGK INSULATORS LTD

AI summary

A method of producing periodic polarization inversion structures requires the provision of first electrode piece part-arrays, each having electrode piece parts on a first main face of a ferroelectric crystal substrate. A voltage is applied on the first electrode piece part-arrays to form first periodic polarization inversion structures. Second electrode piece part-arrays are provided, each having electrode piece parts between the adjacent plural first periodic polarization inversion structures. A voltage is applied on the second electrode piece part-arrays to form second polarization inversion structures.