Layered Electro-Optic Devices for Cryogenic Phase Stability

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Solution Overview

Problem

Electro-optic (EO) devices experience significant degradation of EO effects, such as the Pockels coefficient, at cryogenic temperatures due to crystallographic phase transitions, leading to reduced efficiency and performance in optical switches and modulators.

Innovation Solution

The use of interleaved and interlocked thin EO material layers with interlayers that maintain their lattice structures and polarization directions at cryogenic temperatures, preventing phase transitions and ensuring high EO coefficients.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If EO devices operate at cryogenic temperatures, then device speed and energy efficiency improve, but EO coefficients degrade due to crystallographic phase transitions

Engineering Contradiction:

Improvedevice speedVSAvoidEO coefficients

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The EO material is divided into thin layers (e.g., 10-100 nm thickness) and interleaved with interlayers to form a layered structure. This segmentation prevents bulk phase transitions by constraining each thin EO layer between stable interlayers, maintaining high EO coefficients at cryogenic temperatures while enabling device operation at improved speeds

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite structure combining EO material layers with interlayers having different thermal and structural properties. The interlayers (e.g., oxides, nitrides, or other stable materials) provide structural stability at cryogenic temperatures while the EO layers maintain high electro-optic response, achieving both reliability and performance

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If EO material layers are made thinner to prevent phase transitions, then EO coefficient stability improves, but manufacturing precision requirements increase

Engineering Contradiction:

Improvelattice structure stabilityVSAvoidlayer thickness control

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

Interlayers serve as intermediary structures between EO material layers, providing a stable reference framework that guides and constrains the thin EO layers. These interlayers facilitate controlled deposition processes and provide etch-stop layers, reducing the actual manufacturing precision required for the ultra-thin EO layers while maintaining lattice stability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs advanced deposition techniques (e.g., atomic layer deposition, molecular beam epitaxy) that operate under controlled parameter conditions (temperature, pressure, precursor flow rates) to achieve precise thickness control of thin EO layers. Process parameters are optimized to enable routine fabrication of layers with thickness control within a few nanometers

Inventive Principle:

Principle #35Parameter changes

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

Maintains high EO coefficients at low temperatures, reducing power consumption and increasing efficiency and speed of EO devices by allowing reduced electric fields for refractive index modulation, while minimizing optical losses and device dimensions.

Implementation Method 1

EO modulators or switches may utilize various EO effects, such as free-carrier electro-refraction, free-carrier electro-absorption, Pockels effect, Kerr effect, or the like, to modify light properties during operation

Methodology Applied

Scientific EffectPockels effect: Pockels Effect

Implementation Method 2

Methodology Applied

Scientific EffectKerr effect: Kerr Effect

Data Source

PatentUS20250328037A1Engineered electro-optic devices

Publication Date: 2025.10.23 PSIQUANTUM CORP

AI summary

An electro-optic device includes a substrate, a buffer layer coupled to the substrate, and a first layer stack coupled to the buffer layer. The first layer stack includes a plurality of electro-optic material layers and a plurality of interlayers interleaved with the plurality of electro-optic material layers. The electro-optic device also includes a cladding layer coupled to the first layer stack.