Chip-Scale Atomic Beam Layout With Passive Vacuum Collimation
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Solution Overview
Problem
Conventional atomic beam generating systems are too large and rely on complex manufacturing techniques, limiting their applicability and manufacturability.
Innovation Solution
A chip-scale atomic beam system comprising an atomic vapor source, channels, and a propagation chamber with a pressure differential maintained by passive pumps, such as non-evaporable getter pumps, to collimate and propagate atomic vapor efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional atomic beam generating systems are used, then reliable atomic beam generation is achieved, but the system size becomes too large and manufacturing complexity increases
Solution Approach 1:
The system is divided into functionally distinct chambers (vapor source chamber, collimation chamber, propagation chamber) that can be manufactured separately and then assembled through wafer bonding. Each chamber is optimized for its specific function, allowing standardized manufacturing processes to be applied to each segment independently, thereby reducing overall manufacturing complexity while maintaining reliability.
Solution Approach 2:
Multiple functional chambers are nested within a compact integrated structure where the vapor source chamber, collimation chamber, and propagation chamber are arranged in sequence within a small footprint. This nesting approach achieves chip-scale dimensions by efficiently utilizing three-dimensional space, reducing system size without compromising the reliability of atomic beam generation.
2Reliability
If conventional atomic beam generating systems are used, then reliable atomic beam generation is achieved, but the system volume becomes too large for certain applications
Solution Approach 1:
The system transitions from planar two-dimensional layout to three-dimensional vertical stacking of chambers. By arranging the vapor source chamber, collimation chamber, and propagation chamber in a vertical sequence and bonding wafers together, the system achieves chip-scale volume while maintaining all necessary functional spaces for reliable atomic beam generation.
Solution Approach 2:
The functional chambers are nested within a compact integrated structure where each chamber is positioned within the overall device envelope. This nesting achieves chip-scale dimensions by efficiently utilizing three-dimensional space, reducing system volume without compromising the reliability of atomic beam generation.
3Reliability
If active pumps are used to maintain vacuum, then vacuum quality is improved, but device complexity and power requirements increase
Solution Approach 1:
The system employs passive non-evaporable getter (NEG) pumps that automatically pump gas molecules without requiring external power or control systems. The NEG material spontaneously adsorbs gas molecules when exposed to vacuum, maintaining the required pressure differential between chambers autonomously. This self-service approach improves vacuum quality while eliminating the complexity of active pump control systems.
Solution Approach 2:
The patent replaces active mechanical vacuum pumps with passive non-evaporable getter pumps that use chemical adsorption rather than mechanical motion. This substitution eliminates moving parts, reduces power requirements, and simplifies the vacuum system while maintaining reliable vacuum quality for atomic beam propagation.
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 system achieves a compact and manufacturable design for atomic beams, suitable for applications like atomic clocks and atom interferometers, with efficient collimation and vacuum maintenance.
Implementation Method 1
The atomic vapor source can comprise Rubidium and be configured to emit the atomic vapor when thermally or optically stimulated
Implementation Method 2
The propagation chamber can have an internal pressure less than an internal pressure of the atomic vapor source chamber to enable the collimated atomic vapor to propagate through the propagation chamber
Implementation Method 3
The one or more passive pumps can comprise one or more non-evaporable getter pumps
Data Source
AI summary
An exemplary embodiment of the present disclosure provides a chip-scale atomic beam system comprising an atomic vapor source, a plurality of channels, and a propagation chamber. The atomic vapor source chamber can comprise an atomic vapor source configured to emit an atomic vapor. The plurality of channels can have first ends and second ends. The first ends can be in fluid communication with the atomic vapor source chamber. The plurality of channels can be configured to collimate the atomic vapor as it moves through the plurality of channels from the first ends to the second ends. The propagation chamber can be in fluid communication with the second ends of the plurality of channels. The propagation chamber can have an internal pressure less than an internal pressure of the atomic vapor source chamber to enable the collimated atomic vapor to propagate through the propagation chamber.