Imprint Lithography Nanoshape Patterning for Complex Optical Nanostructures

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Solution Overview

Problem

Existing techniques are deficient in high-throughput fabrication of functional nanostructures with complex geometries on planar and non-planar substrates.

Innovation Solution

A method involving multi-tiered, multi-graded imprint lithography templates is employed, which includes depositing and etching profiled polymer layers on patterned primary materials, followed by selective removal of layers to create nanostructures with customized geometries, and using imprint templates to transfer patterns onto curable liquids for functional material formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional lithography techniques are used, then fabrication process is simple, but manufacturing throughput is low and complex geometries cannot be achieved

Engineering Contradiction:

Improvemanufacturing throughputVSAvoidfabrication process complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The fabrication process is divided into multiple sequential stages: forming imprint templates with specific geometries, depositing functional materials, and performing selective etching. This segmentation allows each stage to be optimized independently, enabling high throughput while managing complexity through modular process design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Imprint templates are pre-formed with complex geometries before the actual fabrication process. This preliminary action allows the templates to serve as reusable masters that transfer patterns at high speed, decoupling the complexity of geometry design from the throughput-critical fabrication steps.

Inventive Principle:

Principle #10Preliminary action

2Shape

If multi-tiered multi-graded imprint lithography is used, then complex geometries are achieved, but fabrication process complexity increases

Engineering Contradiction:

Improvenanostructure geometry complexityVSAvoidfabrication process steps

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The imprint templates incorporate multi-tiered multi-graded structures where different regions have different geometries and properties. This allows complex 3D nanostructures to be formed with single patterning steps, achieving geometric complexity without proportionally increasing process complexity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces intermediate layers including profiled polymer layers and hard mask layers that mediate between the imprint template and the functional material. These intermediaries enable selective etching and pattern transfer, allowing complex geometries to be achieved through controlled material removal rather than direct complex deposition.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If selective etching of polymer and hard mask layers is used, then precise pattern transfer is achieved, but process time increases

Engineering Contradiction:

Improvepattern transfer accuracyVSAvoidetching process duration

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent employs selective etching by changing etch parameters such as chemistry composition, power, and pressure to achieve different etch rates for polymer and hard mask layers. This parameter control allows precise pattern transfer while minimizing total etching time through optimized process conditions.

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

Enables high-throughput fabrication of functional nanostructures with complex geometries on various substrates, including those with high refractive index materials, suitable for applications in photonics and augmented/mixed reality devices.

Implementation Method 1

depositing a first profiled polymer layer onto a patterned multi-tiered primary material

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Implementation Method 2

etching the first profiled polymer layer and the patterned multi-tiered primary material thereby forming a graded depth

Methodology Applied

Scientific EffectEtching: Ablation

Implementation Method 3

transfer patterns onto the curable liquid followed by curing thereby forming an imprinted patterned material

Methodology Applied

Scientific EffectCuring: Photopolymerisation

Data Source

PatentUS20260016744A1Nanoshape patterning techniques that allow high-throughput fabrication of functional nanostructures with complex geometries on planar and non-planar substrates

Publication Date: 2026.01.15 BOARD OF RGT THE UNIV OF TEXAS SYST

AI summary

A method for fabricating functional optical components. A detackable adhesive layer is deposited on an intermediate substrate. A curable liquid is deposited onto the detackable adhesive layer on the intermediate substrate. An imprint template is used to transfer patterns onto the curable liquid followed by curing thereby forming an imprinted patterned material on the intermediate substrate. A layer of functional material is deposited on the imprinted patterned material. Furthermore, a polymer layer is deposited on top of the functional material layer. A correlated etch of the polymer layer and the functional material layer is then performed thereby forming an etched functional material surface. The etched functional material surface is bonded to a final substrate. The imprinted patterned material is then detacked from the intermediate substrate at the detackable adhesive layer.