Planar Ion Trap Electrodes with Rounded Corners
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Solution Overview
Problem
The high precision fabrication of three-dimensional ion trap devices is challenging, and integrating multiple traps is difficult, especially in quantum information applications, where breakdown issues between RF and DC electrodes occur under Ultra High Vacuum conditions, leading to performance degradation.
Innovation Solution
The ion trap device features a substrate with a central DC electrode, RF electrode, and side electrodes, where the electrodes have round corners and are designed using a micro electro mechanical system (MEMS) process to minimize breakdown and enhance ion trapping, with a method involving insulator and conductive film deposition and patterning to form electrode patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three-dimensional ion trap devices are fabricated with high precision, then ion trapping performance is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The patent transitions from three-dimensional ion trap structures to a two-dimensional planar configuration. The ion trap device is fabricated on a substrate with electrodes arranged in a planar geometry, eliminating the need for complex three-dimensional fabrication processes while maintaining ion trapping functionality through conformal mapping of the electrode patterns.
Solution Approach 2:
The ion trap device is divided into separate functional components fabricated on a substrate: central DC electrodes, RF electrodes, and side electrodes. Each electrode type is independently patterned and connected to its respective connector pads, allowing modular fabrication and assembly while simplifying the overall manufacturing process.
2Adaptability or versatility
If multiple ion traps are integrated, then system functionality is improved, but fabrication difficulty and integration complexity increase
Solution Approach 1:
Multiple ion trap units are integrated on a single substrate, sharing common RF electrodes and connector pads. The planar configuration allows multiple trap regions to be defined by patterning central DC electrodes and side electrodes between shared RF electrode structures, enabling multi-functionality without proportional increases in fabrication complexity.
Solution Approach 2:
The RF electrodes serve multiple functions: they generate the radio frequency field for ion trapping, provide structural support for multiple trap regions, and can be shared across different ion trap units. This multi-functional design reduces the total number of components and simplifies the fabrication process while maintaining system versatility.
3Volume of moving object
If RF and DC electrodes are placed close together, then device miniaturization is achieved, but breakdown risk under Ultra High Vacuum conditions increases
Solution Approach 1:
The electrodes are designed with rounded corners instead of sharp edges. This curvature modification reduces electric field concentration at corner regions, thereby minimizing the risk of electrical breakdown between RF and DC electrodes while maintaining compact device dimensions. The rounded geometry is applied to all electrode patterns including central DC electrodes, side electrodes, and RF electrodes.
Solution Approach 2:
An insulator layer is deposited between the RF electrodes and DC electrodes to provide electrical isolation and prevent direct contact. This intermediary layer allows the electrodes to be positioned close together for miniaturization while maintaining reliable electrical separation, preventing breakdown under Ultra High Vacuum conditions.
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
This design reduces the likelihood of breakdown and improves ion trapping capabilities while maintaining performance, allowing for more precise control of ions within the ion trap chip, even under high voltage conditions.
Implementation Method 1
When the electrodes e1 and e4 are grounded and a high voltage RF signal is applied to the electrodes e2 and e3 as shown in FIG. 1A, an electric field (E) is formed as shown in FIG. 1B, and the direction of the electric field (E) is continuously changed in response to the radio frequency (RF) of the applied signal. In this case, electrically charged particles are forced, on average, towards the center of the quadrangle (e.g., a square) defined by the electrodes e1, e2, e3 and e4 in FIG. 1B, when the charge amount of the electrically charged particles, mass of the electrically charged particles, strength of the electric field and the radio frequency satisfy certain mathematical conditions. The potential generated by such average force is referred to as a ponderomotive potential.
Implementation Method 2
at least one central DC electrode (100), an RF electrode (130), and at least one side electrode (140) are disposed on the substrate (101)
Data Source
AI summary
An ion trap device includes a substrate over which at least one central DC electrode, an RF electrode and at least one side electrode are disposed. The central DC electrode includes a DC connector pad and a DC rail connected to the DC connector pad. The RF electrode includes at least one RF rail located adjacent to the DC rail and an RF pad connected to the at least one RF rail. The RF electrode is disposed between the central DC electrode and the side electrode. At least one pair of electrodes among the central DC electrode, the RF electrode and the side electrode have round corners facing each other.