Mechanical Loading for Spatially Patterned Metasurfaces
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Solution Overview
Problem
Conventional methods for fabricating substrate-engraved metasurfaces in high power laser systems result in spatially invariant indices of refraction due to invariant heating processes, limiting their ability to pattern optical properties effectively.
Innovation Solution
A system and method involving controlled mechanical loading to apply varying forces to nanostructured surfaces, allowing for spatial patterning of the metasurface features, thereby modifying the index of refraction and optical properties, using a force application element and position control subsystem to apply predetermined loads along specific axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If invariant heating (furnace or rapid thermal annealing) is used to dewet the metal film, then the processing is simple and scalable, but the nanoparticle mask becomes spatially invariant resulting in uniform index of refraction across the optic
Solution Approach 1:
The patent applies localized quality changes by using a spatially varying mechanical load during the dewetting process. A template with varying contact pressure or a moving loading element creates regions of different nanoparticle sizes and densities across the substrate, enabling spatially patterned index of refraction while maintaining the simplicity of thermal annealing
Solution Approach 2:
The patent applies preliminary mechanical loading to the metal film before or during thermal annealing to pre-pattern the nanoparticle formation. By applying controlled stress or pressure in specific regions prior to heating, the dewetting process produces spatially varying nanoparticle masks that translate to desired index patterns in the final metasurface
2Reliability
If conventional substrate engraving is used to create metasurfaces, then the optical components are durable and resistant to laser fluence, but the method cannot produce spatially varying indices of refraction efficiently
Solution Approach 1:
The patent changes physical parameters during fabrication by applying controlled mechanical stress or pressure variations during the dewetting process. By modulating load magnitude, contact area, or pressure distribution, the method creates spatially varying nanoparticle masks that produce the desired index patterns in a single scalable process, maintaining substrate-engraved durability while enabling complex optical functionality
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 the rapid and efficient fabrication of metaoptics with spatially varying indices of refraction, suitable for high energy laser applications, enhancing durability and optical performance by allowing for the creation of thin lenses, aberration correction, and flat 'freeform' optics.
Implementation Method 1
A force application element configured to apply a force to the pre-existing, nanostructured surface with the first spatial feature distribution
Implementation Method 2
dewet the thin metal film via thermal annealing to transform the film into an ensemble of nanoparticles
Data Source
AI summary
The present disclosure relates to a system for producing a patterned nanostructured surface on a component from a pre-existing, nanostructured surface with a first spatial feature distribution on the component. The system makes use of a force application element configured to apply a force to the pre-existing, nanostructured surface, and a force application control subsystem. The force application control subsystem is configured to control elevational movement of the force application element along a first axis of movement into and out of contact with the pre-existing, nanostructured surface to apply a predetermined load to the pre-existing, nanostructured surface. The predetermined load is sufficient to modify the pre-existing, non-patterned nanostructured surface to create the patterned nanostructured surface.