Variable-Width RF Electrodes for Stable Ion Trap Shuttling
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Solution Overview
Problem
Existing ion trap devices experience voltage drop-offs along shuttling paths, affecting radial motion frequencies and stability of ion shuttling, and lack scalability for trapping larger numbers of ions.
Innovation Solution
A structured electrode layer with varying widths and configurations of RF and DC electrodes, combined with electronic circuitry to adjust DC voltages based on distance from the RF feeding point, maintains constant radial frequencies and stable shuttling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF signals are fed into the ion trap device, then ions can be trapped and controlled, but voltage drop occurs along the shuttling path affecting radial motion frequencies
Solution Approach 1:
The patent applies local quality by making the RF electrode width position-dependent, with narrower sections at distances where voltage drop is more significant. This creates non-uniform electrode geometry that compensates for position-dependent voltage variations, maintaining stable radial motion frequencies throughout the shuttling path.
Solution Approach 2:
The patent changes the geometric parameter (electrode width) as a function of position along the shuttling path. By varying the RF electrode width according to the voltage drop characteristics at different positions, the system maintains constant radial frequencies despite RF signal attenuation along the path.
2Quantity of substance
If the ion trap device is scaled up to trap more ions, then ion capacity increases, but voltage drop-offs become more pronounced
Solution Approach 1:
The patent applies local quality by making the RF electrode width position-dependent, with narrower sections at distances where voltage drop is more significant. This creates non-uniform electrode geometry that compensates for position-dependent voltage variations, maintaining stable radial motion frequencies throughout the shuttling path.
Solution Approach 2:
The patent changes the geometric parameter (electrode width) as a function of position along the shuttling path. By varying the RF electrode width according to the voltage drop characteristics at different positions, the system maintains constant radial frequencies despite RF signal attenuation along the path.
3Stability of the object's composition
If DC electrode voltages are adjusted to compensate for RF voltage drop, then radial frequencies stabilize, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-configuring the RF electrode geometry to compensate for voltage drop. Instead of using complex real-time feedback control, the electrode structure itself is designed with position-dependent width that anticipates and compensates for RF signal attenuation, simplifying the control system.
Solution Approach 2:
The patent applies self-service by making the electrode geometry itself the compensation mechanism. The position-dependent width of the RF electrode automatically compensates for voltage drop without requiring external active control elements, allowing the structure to self-regulate the radial frequencies.
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
Ensures stable and efficient shuttling of ions with consistent radial frequencies, allowing for scalable ion trapping and reduced voltage drop-offs, enhancing the operational stability of ion trap devices.
Implementation Method 1
a structured electrode layer, wherein the structured electrode layer forms multiple electrodes of an ion trap configured to trap ions in a zone above the structured electrode layer
Implementation Method 2
The multiple electrodes comprise a first RF electrode and a second RF electrode extending along a first direction
Implementation Method 3
When feeding RF signals into a feeding point of an ion trap device, a voltage drop may occur along the shuttling path
Implementation Method 4
The multiple electrodes further comprise at least one center DC electrode arranged between the first RF electrode and the second RF electrode
Data Source
AI summary
A device for controlling trapped ions includes a structured electrode layer, the structured electrode layer forming multiple electrodes of an ion trap configured to trap ions in a zone above the structured electrode layer. The multiple electrodes include a first RF electrode and a second RF electrode extending along a first direction. The multiple electrodes further include at least one center DC electrode arranged between the first RF electrode and the second RF electrode and extending along the first direction. A first width of the first RF electrode and a second width of the second RF electrode decrease along the first direction.