Periodic Polarization Electrode Uniformity Control
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Solution Overview
Problem
Existing periodic polarization reversal elements face challenges in uniformly controlling the shape of the ends of the periodic polarization reversal structure due to the absence or improper placement of a solid electrode below the stripe electrode sections, leading to non-uniform alignment and unnecessary polarization reversal.
Innovation Solution
A periodic polarization reversal electrode comprising stripe electrode sections on the +Z surface of a ferroelectric crystal substrate, covered by an insulation film, and an equipotential electrode section opposing the stripe electrode sections across the insulation film without contacting the substrate, with a planar electrode on the -Z surface to generate a controlled electric field for uniform polarization reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solid electrode is provided directly below the ends of the stripe electrode sections, then the electric field distribution is improved, but polarization reversal structure is formed unnecessarily below the equipotential electrode section
Solution Approach 1:
An insulation film is introduced as an intermediary layer between the equipotential electrode section and the ferroelectric crystal substrate. This insulation film prevents direct electrical contact while allowing the equipotential electrode to maintain uniform potential distribution across the stripe electrode sections without causing unnecessary polarization reversal below the equipotential electrode area.
Solution Approach 2:
The electrode structure is segmented into distinct functional regions: stripe electrode sections for generating the periodic polarization reversal pattern, equipotential electrode sections for maintaining uniform potential, and insulation film regions for electrical isolation. This segmentation allows each component to perform its specific function without interfering with others.
2Manufacturing precision
If no solid electrode is provided directly below the ends of the stripe electrode sections, then unnecessary polarization reversal is avoided, but the shape of the ends of the periodic polarization reversal structure is not uniformly aligned
Solution Approach 1:
The insulation film serves as a mediator that enables the equipotential electrode to control the electric field distribution indirectly. By preventing direct contact, it allows the equipotential electrode to influence the electric field shape without causing unwanted polarization reversal, thus achieving uniform alignment while maintaining control.
Solution Approach 2:
The electrical parameters (potential distribution, electric field strength) are carefully controlled through the insulation film to achieve uniform polarization reversal structure ends. The insulation film modifies the electric field distribution parameters to match the desired uniform alignment while preventing excessive field strength that would cause unwanted polarization reversal.
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 configuration allows for precise control and uniform formation of the periodic polarization reversal structure, ensuring that polarization reversal occurs only where intended, thereby achieving a uniformly shaped periodic polarization reversal element.
Implementation Method 1
an electric field is generated in the area of the ferroelectric crystal substrate directly below the plurality of stripe electrode sections by applying a voltage to the equipotential electrode section
Implementation Method 2
polarization reversal occurs directly below the stripe electrode sections (cross-piece parts) on the +Z surface, and a periodic polarization reversal structure is formed inside the ferroelectric crystal substrate
Implementation Method 3
a periodic polarization reversal element can output laser light of a wavelength which is a second harmonic by performing quasi phase matching on the inputted laser light
Implementation Method 4
a periodic polarization reversal element can output laser light of a wavelength which is a second harmonic
Data Source
AI summary
A periodic polarization reversal electrode, periodic polarization reversal structure forming method and periodic polarization reversal element. The element includes a plurality of stripe electrode sections with a stripe shape extending in parallel at a gap from each other, arranged in contact with the +Z surface of a ferroelectric crystal substrate; an insulation film arranged over the +Z surface so as to cover the plurality of stripe electrode sections; and an equipotential electrode section which has a portion that opposes at least a part of each of the plurality of stripe electrode sections across the insulation film and is arranged over the insulation film without contacting the ferroelectric crystal substrate or the plurality of stripe electrode sections, wherein an electric field is generated in the area of the ferroelectric crystal substrate directly below the plurality of stripe electrode sections by applying a voltage to the equipotential electrode section.