Elastomeric Optical Device with Soft Elastomer and Stiff Dielectric
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Solution Overview
Problem
Existing elastomeric optical devices lack mechanical and chemical properties that enable stable deformation and longevity, and they fail to transition effectively from clear to opaque or translucent states with modest voltage applications, while also requiring improved dielectric layers for proper functioning.
Innovation Solution
An elastomeric optical device comprising a first transparent electrode, a dielectric layer with higher stiffness than the elastomer layer, and a second transparent electrode, where the elastomer layer has a Shore OOO hardness of less than 15 and an elastic modulus of less than 20 kPa, allowing compression and reversible switching between transparent, translucent, and opaque states with controlled voltage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the elastomer layer has low stiffness (Shore OOO hardness < 15, elastic modulus < 20 kPa) to facilitate deformation, then the device can switch between optical states with modest voltage, but the mechanical stability and structural integrity deteriorate
Solution Approach 1:
The patent employs a composite structure consisting of a soft elastomer layer (Shore OOO hardness < 15, elastic modulus < 20 kPa) combined with a stiffer dielectric layer. This composite configuration allows the elastomer to deform easily under voltage while the dielectric layer provides structural support and maintains overall mechanical stability, resolving the contradiction between ease of deformation and mechanical strength.
2Productivity
If the elastomer layer is highly deformable to enable clear to opaque transition, then optical switching efficiency improves, but chemical stability and device longevity worsen
Solution Approach 1:
The patent uses a composite material system where a highly deformable elastomer layer (optimized for optical switching) is combined with a chemically stable dielectric layer. The elastomer enables efficient clear-to-opaque transitions through voltage-induced deformation, while the dielectric layer provides chemical stability and protects against degradation, thereby maintaining device longevity despite the elastomer's high deformability.
Solution Approach 2:
The patent applies different material properties to different layers: the elastomer layer is optimized locally for deformability and optical switching performance, while the dielectric layer is optimized locally for chemical stability and electrical insulation. This local differentiation of material qualities allows each layer to excel at its specific function without compromising overall device reliability.
3Strength
If the dielectric layer has high stiffness to support the elastomer layer, then structural integrity improves, but compatibility with elastomer mechanical properties worsens
Solution Approach 1:
The patent employs a composite structure with a stiff dielectric layer providing structural integrity and a soft elastomer layer providing deformability. The interface between these layers is designed to ensure mechanical compatibility, allowing the stiff dielectric to support the soft elastomer while accommodating its deformation during optical switching cycles.
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 device achieves stable and reversible deformation, maintaining optical and electrical properties, with enhanced mechanical and chemical stability, enabling efficient switching between states and prolonged device longevity.
Implementation Method 1
the elastomer layer is compressed between two transparent electrodes in response to establishing an electric field between the two transparent electrodes
Implementation Method 2
The wrinkling causes diffusion or scattering of light transmitted through the wrinkled elastomer/gold
Data Source
AI summary
The invention provides an elastomeric optical device having a first optical state and a second optical state. The device is transparent when in the first optical state and translucent or opaque when in the second optical state. The device comprises, in sequence, a first transparent electrode, a dielectric layer, an elastomer layer, and a second transparent electrode. The elastomer layer preferably has certain mechanical properties, such as a Shore OOO hardness of less than 15, and/or certain chemical properties, such as being substantially devoid of unreacted sites. The second transparent electrode is configured to compress the elastomer layer in response to an electric field between the first and second transparent electrodes, such that when the elastomeric optical device is in the second optical state, the elastomer layer is compressed between the first and second transparent electrodes. Methods of operating an elastomeric optical device are also provided.