Magneto-Plasmonic Optical Isolator for Photonic Circuit Integration

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Solution Overview

Problem

Existing non-reciprocal optical components, such as optical isolators and circulators, are bulky and difficult to integrate into photonic circuits due to the need for amplification and complex resonator structures.

Innovation Solution

A compact non-reciprocal optical component is developed using a magneto-plasmonic guidance structure with sub-wavelength dimensions, incorporating a selection region, a differentiation region, and a non-reciprocal treatment region to selectively concentrate optical signal energy on a single interface, enabling non-reciprocal treatment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional non-reciprocal optical components are used, then non-reciprocal functionality is achieved, but the device becomes bulky and difficult to integrate

Engineering Contradiction:

Improvenon-reciprocal functionalityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent changes the physical parameters of the optical component by introducing magneto-plasmonic interfaces with specific geometries and materials. The treatment interfaces have different geometries (e.g., different cavity dimensions, curvature, or positioning) that modify the optical path and interaction with magneto-plasmonic modes, enabling non-reciprocal functionality in a compact form factor without requiring bulky resonators

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite structures combining magneto-optical materials with plasmonic materials to create magneto-plasmonic interfaces. This composite approach integrates multiple functionalities (magneto-optic effect and plasmon guidance) into a single compact component, achieving non-reciprocity without the need for separate amplification stages or large resonator structures

Inventive Principle:

Principle #40Composite materials

2Reliability

If resonator structures are added to enhance non-reciprocal effect, then non-reciprocity is improved, but device complexity increases

Engineering Contradiction:

Improvenon-reciprocal effect strengthVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the non-reciprocal treatment function directly into the magneto-plasmonic guidance structure by implementing treatment interfaces with asymmetric geometries along the propagation path. This integration eliminates the need for separate resonator structures, reducing device complexity while maintaining effective non-reciprocity through the combined magneto-plasmonic-treatment interface design

Inventive Principle:

Principle #5Merging (Combining)

3Volume of moving object

If magneto-plasmonic guidance with sub-wavelength dimensions is used, then compactness is achieved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvecomponent sizeVSAvoidinterface geometry precision

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent applies local quality by creating asymmetric geometries specifically at the treatment interfaces along the magneto-plasmonic guidance path. Rather than requiring uniform high precision throughout the entire structure, the design focuses precision requirements on specific local regions (the treatment interfaces) where asymmetric features are needed, while other regions can tolerate broader manufacturing tolerances

Inventive Principle:

Principle #3Local quality

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 allows for the integration of a high-performance, compact non-reciprocal optical component into photonic circuits, achieving efficient isolation and signal routing with reduced bulk and losses, and is compatible with standard manufacturing processes.

Implementation Method 1

a metallic layer providing a plasmon guidance effect, i.e. that produces a resonance between the optical signal in the guide and the surface electrons of the metallic wall

Methodology Applied

Scientific EffectPlasmon guidance:

Implementation Method 2

non-reciprocal optical component by using magneto-optical properties of the Kerr transverse effect type (TMOKE 'Transverse Magneto Optical Kerr Effect')

Methodology Applied

Scientific EffectMagneto-optical Kerr effect: Magneto-Optic Kerr Effect

Implementation Method 3

produces a resonance between the optical signal in the guide and the surface electrons of the metallic wall

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS12222591B2Integrable non-reciprocal optical component, optical isolator, optical circulator and integrated circuit

Publication Date: 2025.02.11 UNIV PARIS SACLAY

AI summary

An integrable, non-reciprocal optical component, with guidance, between two magneto-plasmonic interfaces each formed between a dielectric and a metal. An optical port and an input signal passes through a selection region providing a selected signal whose energy is concentrated in a single plasmonic mode, LRSPP or SRSPP, by a selection aperture of a width for which these modes have optical impedances that differ significantly from each other, one of which (z1eff) is close to, or equal to, the input optical impedance (z0eff). The selected signal passes through a differentiation region, which enhances the asymmetry between the two magneto-plasmonic interfaces, to concentrate its energy on a single magneto-plasmonic interface. The differentiated signal passes through a non-reciprocal treatment region formed by two magneto-plasmonic interfaces of non-equivalent geometries. The input signal will thus undergo different treatment from a reverse signal.