Graded-Index Nanorod Coating for Optical Interface Reflection

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Solution Overview

Problem

Legacy photonics packages face significant reflection loss at optical interfaces due to mismatched refractive indices, limiting their performance and efficiency in optical data communication systems.

Innovation Solution

A graded-index nanorod coating with layers of nanorods, such as TiO2 and SiO2, is applied between optical mediums using oblique-angle deposition techniques to achieve a refractive index close to that of air, reducing reflection and enhancing optical coupling across a broad wavelength range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional coating layer is used between optical mediums, then mechanical stability is provided, but reflection loss occurs due to refractive index mismatch

Engineering Contradiction:

Improvemechanical stabilityVSAvoidreflection loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by transitioning from a conventional homogeneous coating layer to a nanorod-based graded-index coating. The refractive index is gradually modified through the nanorod structure, creating a transition zone that reduces reflection loss while maintaining mechanical stability. This resolves the contradiction by changing the optical parameters of the coating without sacrificing mechanical properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining nanorods with a matrix material to form a graded-index coating. This composite structure allows the coating to simultaneously provide mechanical support and optical transition functions, eliminating the need for separate layers and reducing reflection loss while maintaining reliability.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If a single-layer coating is used, then manufacturing is simple, but reflection loss cannot be sufficiently reduced across broad wavelengths

Engineering Contradiction:

Improvecoating application simplicityVSAvoidreflection loss across wavelengths

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent applies local quality by creating a graded-index structure where the nanorod density and size vary continuously through the coating thickness. This local variation in nanorod distribution creates different refractive indices at different depths, enabling broad-spectrum reflection reduction while maintaining a relatively simple single-layer coating structure that can be deposited using standard oblique-angle deposition techniques.

Inventive Principle:

Principle #3Local quality

3Loss of energy

If the coating refractive index is matched to air, then reflection loss is reduced, but adhesion to optical mediums may be compromised

Engineering Contradiction:

Improvereflection lossVSAvoidadhesion to optical medium

Core Design Contradiction:

Loss of energyVSStrength

Solution Approach 1:

The patent resolves the adhesion contradiction through composite materials by embedding nanorods within a matrix material that provides strong bonding to the optical medium. The matrix material ensures mechanical adhesion while the nanorods provide the graded-index optical transition, allowing the coating to achieve both low reflection loss and strong adhesion simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies parameter changes by carefully controlling the nanorod size, density, and distribution within the coating. These parameter adjustments allow the coating to achieve the desired refractive index transition for reflection reduction while maintaining sufficient mechanical interlocking and chemical bonding with the optical medium through the matrix material.

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

The solution significantly reduces reflection loss and enables robust, high-bandwidth, low-power optical data communication by matching the refractive index of the coating to the surrounding optical mediums, improving mechanical stability and adhesion while maintaining low reflection across various wavelengths.

Implementation Method 1

Methodology Applied

Scientific EffectGraded-index coating: Refraction

Implementation Method 2

A graded-index nanorod coating with layers of nanorods, such as TiO2 and SiO2, is applied between optical mediums using oblique-angle deposition techniques

Methodology Applied

Scientific EffectOblique-angle deposition: Deposition (physical)

Data Source

PatentUS20240111089A1Nanorod coating between two optical mediums

Publication Date: 2024.04.04 INTEL CORP

AI summary

Embodiments herein relate to systems, apparatuses, techniques, or processes for improving the refractive index of the coating that optically couples with an optical medium, wherein the coating includes one or more layers that include a plurality of nanorods. The plurality of nanorods within each of the one or more layers may have a similar orientation in the chemical composition. The nanorods within separate layers may have different characteristics, including different orientations, different sizes, and/or different chemical compositions. Other embodiments may be described and/or claimed.