Perovskite Light Modulator Electrode Segmentation for Stability
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Solution Overview
Problem
In electro-optical elements, the converse piezoelectric or electrostrictive effects can interfere with stable light modulation due to the configuration of electrodes on both surfaces of the KTN layer, leading to instability in light modulation.
Innovation Solution
A light modulator design featuring a perovskite-type electro-optic crystal with a high relative permittivity, where the first and second electrodes are disposed on the first and second surfaces respectively, with at least one electrode partially covering the surface, and an electric field applied between them, preventing the converse piezoelectric or electrostrictive effects by functioning as a damper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are disposed over the entire front surface and rear surface of the KTN layer, then the electro-optical element can be manufactured with complete electrode coverage, but the converse piezoelectric effect or electrostrictive effect increases causing unstable light modulation
Solution Approach 1:
The patent divides the electrode structure into segmented regions: a first electrode region and a second electrode region that are separated by a predetermined distance rather than covering the entire surface continuously. This segmentation prevents the electrodes from extending to the edges of the electro-optic crystal, thereby reducing the converse piezoelectric effect and electrostrictive effect while maintaining effective light modulation coverage in the central region.
Solution Approach 2:
The patent applies different electrode configurations to different regions of the electro-optic crystal. The central region contains the electrode structures necessary for light modulation, while the peripheral regions near the edges are left without electrode extensions. This local differentiation allows the electrodes to function effectively where needed while avoiding the harmful effects at the edges.
2Stability of the object's composition
If electrodes are disposed over the entire surface of the KTN layer, then the electric field can be applied uniformly across the crystal, but resonance occurs due to converse piezoelectric or electrostrictive effects
Solution Approach 1:
The patent extracts or removes the electrode structures from the peripheral regions near the edges of the electro-optic crystal, keeping them only in the central region. This extraction eliminates the source of the converse piezoelectric effect and electrostrictive effect at the edges, thereby preventing resonance while maintaining sufficient electric field uniformity in the central modulation region.
3Device complexity
If electrodes cover the entire surface, then the device structure is simple and compact, but stable light modulation cannot be achieved
Solution Approach 1:
The patent implements a segmented electrode design where the first and second electrodes are divided into distinct regions separated by a gap. This segmentation maintains relative structural simplicity while achieving the critical function of preventing edge-related resonance and instability, thus resolving the contradiction between structural simplicity and modulation stability.
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 ensures stable light modulation by preventing resonance and maintaining light modulation stability compared to full-surface electrode configurations.
Implementation Method 1
a perovskite-type electro-optic crystal having a relative permittivity of 1,000 or higher... a drive circuit for applying an electric field between the first electrode and the second electrode
Implementation Method 2
a perovskite-type electro-optic crystal having a relative permittivity of 1,000 or higher
Implementation Method 3
an converse piezoelectric effect or an electrostrictive effect increases when an electric field is applied to the KTN layer... At least one of the first electrode and the second electrode partially covers the first surface or the second surface
Implementation Method 4
an converse piezoelectric effect or an electrostrictive effect increases when an electric field is applied to the KTN layer
Implementation Method 5
At least one of the first electrode and the second electrode partially covers the first surface or the second surface... functioning as a damper
Data Source
AI summary
A light modulator includes a perovskite-type electro-optic crystal including a first surface to which the input light is input and a second surface which faces the first surface; a first electrode which is disposed on the first surface of the electro-optic crystal and through which the input light is transmitted; a second electrode which is disposed on the second surface of the electro-optic crystal and through which the input light is transmitted; and a drive circuit for applying an electric field between the first electrode and the second electrode. The first electrode is disposed alone on the first surface. The second electrode is disposed alone on the second surface. At least one of the first electrode and the second electrode partially covers the first surface or the second surface. A propagation direction of the input light and an applying direction of the electric field are parallel to each other.