Ion Trap Electrode Structure With Gradient Etching Support
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Solution Overview
Problem
The mechanical instability and potential lift-off of small electrodes in ion traps due to mechanical stress and uneven etching rates in ion trap designs limit the scalability and stability of ion trap devices for quantum computing applications.
Innovation Solution
A device with a substrate and a metal layer, where an electrode is disposed over the metal layer, and an electrical insulator with an etching rate gradient is used between the electrode and the metal layer to stabilize the electrode structure, preventing excessive undercutting and maintaining electrode stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the structural width of electrodes is reduced to increase the number of trapped ions, then the scalability of ion trap devices is improved, but the mechanical stability of electrodes deteriorates due to bending or lift-off
Solution Approach 1:
The patent applies local quality by creating a non-uniform etching rate distribution in the electrical insulator layer. The etching rate is higher near the substrate and lower near the electrode, forming a gradient structure that locally reinforces the support for smaller electrodes while maintaining charge shielding properties in other regions. This selective modification of material properties at different locations resolves the contradiction between electrode miniaturization and mechanical stability.
2Object-generated harmful factors
If dielectric surfaces are etched back under electrodes to shield charges, then electrical noise is reduced, but mechanical stress causes electrode bending or lift-off
Solution Approach 1:
The patent implements local quality by spatially varying the etching rate within the electrical insulator layer. The higher etching rate near the substrate creates a recessed region that maintains charge shielding functionality, while the lower etching rate near the electrode preserves mechanical support. This localized differentiation of etching characteristics allows simultaneous achievement of electrical noise reduction and electrode stability.
Solution Approach 2:
The patent applies parameter changes by modifying the etching rate parameter as a function of position within the electrical insulator layer. By changing the etching rate from high (near substrate) to low (near electrode), the patent creates a gradient structure that transforms the uniform etching process into a spatially selective process, thereby resolving the contradiction between charge shielding and mechanical support.
3Ease of manufacture
If uniform etching rate is used in electrical insulator, then manufacturing is simplified, but excessive undercutting occurs leading to electrode instability
Solution Approach 1:
The patent applies parameter changes by transforming the constant etching rate parameter into a spatially varying parameter. The etching rate is changed as a function of position (higher near substrate, lower near electrode), creating a gradient that prevents excessive undercutting. This parameter modification maintains manufacturing feasibility while dramatically improving electrode stability by controlling the etching profile.
Data Source
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Figure 6A~7C
AI summary
A device (300) for controlling trapped ions (180) includes a substrate. A metal layer is disposed over the substrate (120). An electrode (125, M3) of an ion trap is disposed over the metal layer (135, M2), wherein the electrode is configured to trap one or more ions in a space above the electrode. An electrical insulator (130) is disposed between the metal layer and the electrode. The electrical insulator comprises an upper surface facing towards the electrode and a lower surface facing towards the metal layer. An etching rate of the electrical insulator increases along a direction pointing from the upper surface to the lower surface.