Composite Antireflection Coating for Optical Contrast

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Solution Overview

Problem

Existing absorbent antireflection layers face challenges in producing 'ideal' layers for complete reflection extinction, are not perfectly smooth on the atomic scale, and have non-uniform ligand distribution, making them difficult to functionalize for chemical or biological detection applications.

Innovation Solution

A composite antireflection coating comprising a metal 'contrast' sublayer and a sensitive layer made of 1 to 5 sheets of two-dimensional material, such as graphene, which provides a smooth surface and uniform ligand distribution, enabling better reflection extinction and functionalization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a single absorbent antireflection layer is used, then reflection extinction is achieved, but the surface is not perfectly smooth and ligand distribution is non-uniform

Engineering Contradiction:

Improvereflection extinctionVSAvoidsurface smoothness and ligand distribution uniformity

Core Design Contradiction:

Loss of energyVSManufacturing precision

Solution Approach 1:

The patent uses a composite structure consisting of a bottom absorbent layer (providing reflection extinction) and a top two-dimensional material layer (providing atomic smoothness and uniform ligand distribution). This combination resolves the contradiction by assigning different functions to different materials in the composite structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The antireflection coating is segmented into two distinct functional layers: the first layer (absorbent material) handles reflection extinction, while the second layer (two-dimensional material) handles surface smoothness and ligand distribution. This segmentation allows each layer to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

2Illumination intensity

If conventional antireflection layers are used, then contrast is increased, but functionalization for chemical or biological detection is difficult

Engineering Contradiction:

Improveoptical contrastVSAvoidfunctionalization ease

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The composite structure combines conventional absorbent antireflection material (for contrast enhancement) with two-dimensional material (for functionalization). The top layer's atomic smoothness and chemical stability make it ideal for ligand attachment while preserving the optical contrast benefits of the bottom layer.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by making the top surface of the coating specifically suitable for functionalization (through the two-dimensional material layer) while the bulk of the coating maintains its absorbent properties for contrast enhancement. This localized optimization resolves the contradiction between contrast and functionalization ease.

Inventive Principle:

Principle #3Local quality

3Reliability

If the real part of the refractive index is modified, then antireflection performance changes, but it is difficult to modify the real part of the refractive index

Engineering Contradiction:

Improveantireflection performanceVSAvoidrefractive index modification ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the optical parameters by introducing a two-dimensional material layer with specific optical properties (low absorption in visible range, high transparency). This parameter change achieves the desired antireflection performance modification without requiring difficult changes to the real part of the refractive index of the bulk 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 composite structure facilitates practically perfect reflection extinction and easier functionalization, enhancing the contrast-amplifying capabilities for observing samples and detecting chemical or biological species.

Implementation Method 1

an absorbent layer referred to as the sensitive layer, distinct from said contrast sublayer and comprising between 1 and 5 sheets of at least one two-dimensional material

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

the increase in contrast results from an interference effect that involves multiple reflections at the incident medium/layer and layer/emergent medium interfaces

Methodology Applied

Scientific EffectOptical interference: Interference

Data Source

PatentUS11635367B2Contrast-amplifying carriers using a two-dimensional material

Publication Date: 2023.04.25 UNIVERSITE DU MAINE

AI summary

A contrast-amplifying carrier for observing a sample, includes a transparent substrate bearing at least one absorbent coating suitable for behaving as an antireflection coating when it is illuminated at normal incidence at an illumination wavelength λ through the substrate and when the face of the coating opposite the substrate is in contact with a medium referred to as a transparent ambient medium, the refractive index n3 of which is lower than that of the refractive index n0 of the substrate. The absorbent coating comprises: an absorbent sublayer referred to as the contrast sublayer, deposited on the surface of the transparent substrate; and an absorbent layer referred to as the sensitive layer, distinct from the contrast sublayer and comprising between 1 and 5 sheets of a graphene-type material. Methods for producing and for using such a contrast-amplifying carrier are also provided.