Thin Opaque Mask with MIM Structures for Infrared Detection
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Solution Overview
Problem
Existing components for detecting electromagnetic radiation, particularly in infrared wavelengths, face issues with parasitic reflection, shading, and delamination due to thick opaque masks, which lead to spurious signals and deterioration at low temperatures.
Innovation Solution
A detection component with a thin opaque mask comprising a stack of metals and a transparent material, forming MIM structures, which minimizes reflection and absorption, reducing the risk of delamination and spurious signals, and is designed to operate effectively at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a thick opaque mask is used to block electromagnetic radiation, then the blocking effectiveness is improved, but parasitic reflection increases causing spurious signals
Solution Approach 1:
The patent applies a composite material structure consisting of multiple layers with different optical properties. The stack includes a first opaque layer (e.g., chromium or aluminum), a transparent layer (e.g., silicon dioxide or silicon nitride), and a second opaque layer. This composite structure reduces parasitic reflection compared to a single thick metal layer while maintaining effective electromagnetic radiation blocking.
Solution Approach 2:
The patent transitions from a single-dimensional thick mask to a multi-dimensional layered structure. By adding vertical layering with alternating opaque and transparent materials, the solution addresses reflection issues that cannot be solved by simply increasing or decreasing mask thickness in one dimension.
2Object-affected harmful factors
If a thick opaque mask is used to block electromagnetic radiation, then the blocking effectiveness is improved, but shading and diffraction increase causing photon leakage
Solution Approach 1:
The alternating opaque and transparent layers create a structure that controls photon behavior more precisely than a single thick layer. The transparent layers reduce diffraction effects at interfaces while the opaque layers maintain blocking effectiveness, thereby reducing photon leakage.
3Object-affected harmful factors
If a thick opaque mask is used to block electromagnetic radiation, then the blocking effectiveness is improved, but the risk of deterioration and delamination increases at low temperatures
Solution Approach 1:
The multi-layer composite structure distributes mechanical stress more evenly than a single thick layer. The transparent intermediate layers act as stress buffers between opaque layers, reducing the risk of delamination and deterioration when the detector is cooled to cryogenic temperatures.
Solution Approach 2:
The patent uses thin film structures for each layer, with the total mask thickness being much less than conventional single-layer masks. These thin films are more flexible and better adapted to thermal contraction at low temperatures, reducing mechanical failure risks.
4Reliability
If a thin opaque mask is used to reduce deterioration risk, then the reliability at low temperature is improved, but the blocking effectiveness decreases
Solution Approach 1:
The composite structure achieves enhanced blocking effectiveness despite reduced total thickness. The multiple opaque layers work synergistically with the transparent layers to provide superior radiation blocking compared to a single thin layer, while maintaining low-temperature reliability.
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 component effectively blocks electromagnetic radiation, reduces parasitic reflections, and minimizes the risk of delamination, leading to improved signal quality and component stability at low temperatures.
Implementation Method 1
an opaque mask arranged on a portion of the second surface of the support to block the electromagnetic radiation for at least one of the detection structures
Implementation Method 2
parasitic reflection in the enclosure containing the component
Implementation Method 3
the second metal layer, the transparent layer, and the assembly of metal elements forming MIM structures in the wavelength range
Data Source
AI summary
A detection component is provided for detecting electromagnetic radiation, the detection component comprising a mask arranged to block the electromagnetic radiation for at least one detector. The opaque mask comprises a successive stack of a first metal layer, a second metal layer, a third transparent layer having a low optical index, and an assembly of metal components. The second metal layer, the transparent layer, and the assembly of components form MIM structures in the wavelength range. The invention further relates to a method for manufacturing such a detection component.