Diamond Broad Band Mirror Sacrificial Substrate Release
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Solution Overview
Problem
Existing broad band mirror systems for space telescopy lack a practical method to integrate reflective metal and diamond layers effectively, facing challenges such as high deposition temperatures, surface scarring during diamond synthesis, and contamination issues, which limit their wavelength coverage and reliability.
Innovation Solution
A method involving a sacrificial substrate for diamond deposition, followed by smoothing and bonding a reflective metal layer, and finally attaching a mechanical substrate, while removing the sacrificial layer to create a durable and reflective broad band mirror structure that extends wavelength coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diamond layers are deposited using conventional methods, then diamond coating is achieved, but high deposition temperatures and surface scarring occur
Solution Approach 1:
A sacrificial substrate layer is introduced as an intermediary between the final substrate and the diamond layer. This sacrificial layer serves as a temporary hosting medium during diamond deposition, allowing surface smoothing operations to be performed on it. After diamond layer formation and smoothing, the sacrificial substrate is removed, leaving the diamond layer on the final substrate without the scarring issues that would occur if diamond were deposited directly on the final substrate surface.
2Adaptability or versatility
If reflective metal layers are added to extend wavelength coverage, then broad band reflectivity is improved, but contamination and oxidation issues arise
Solution Approach 1:
The mirror system employs a composite structure combining diamond layer and reflective metal layer. The diamond layer serves as a protective outer coating that is highly resistant to contamination and oxidation, while the reflective metal layer beneath it provides enhanced wavelength coverage. This composite arrangement allows the metal to extend spectral response without being directly exposed to environmental contaminants, thus resolving the contradiction between broad band reflectivity and contamination resistance.
3Temperature
If diamond and metal layers are integrated, then thermal management is improved, but fabrication complexity increases
Solution Approach 1:
The fabrication process is segmented into distinct stages: first depositing diamond on a sacrificial substrate, then smoothing the diamond surface, subsequently depositing the reflective metal layer, and finally removing the sacrificial substrate. This segmentation allows each operation to be optimized independently and performed under appropriate conditions, managing the overall fabrication complexity through structured decomposition of the multi-layer integration process.
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 enables broad band mirrors with enhanced wavelength coverage, improved thermal management, and reduced contamination, making them suitable for space exploration applications by utilizing diamond's superior reflectivity and protective properties.
Implementation Method 1
diamond's superior reflectivity
Implementation Method 2
The sacrificial substrate layer may then be removed, for example, by chemical etching
Implementation Method 3
depositing a reflective metal layer on the diamond layer
Data Source
AI summary
A broad band mirror system and method, wherein the system includes a mechanical substrate layer, a reflective metal layer on the mechanical substrate level, and a diamond layer, and the method includes the steps of selecting a sacrificial substrate layer, depositing a diamond layer on the substrate layer, smoothing a first surface of the diamond layer, depositing a reflective metal layer on the diamond layer, bonding a mechanical substrate to the diamond layer, removing the sacrificial substrate level, and smoothing a second diamond surface.