PIC-Bonded Vacuum Cell Assemblies for High-Vacuum Integrity
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Solution Overview
Problem
Existing atomic sensors face challenges in maintaining high vacuum conditions while integrating various measurement components due to contamination from external sources, which affects the accuracy and precision of measurements.
Innovation Solution
The integration of a vacuum envelope with a photonic integrated circuit (PIC) using anodic bonding, where the PIC forms a wall of the vacuum envelope, and nonplanar waveguides with bridge structures to hermetically seal and transmit light, along with components like a magneto-optical trap and ion pump, to create a robust and compact assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vacuum envelope is integrated with a photonic integrated circuit (PIC) using anodic bonding, then measurement accuracy and compactness are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent integrates the vacuum envelope and photonic integrated circuit into a single unified structure through anodic bonding. The PIC forms an integral part of the vacuum envelope wall, eliminating the need for separate mounting structures and reducing overall device complexity while maintaining measurement accuracy.
Solution Approach 2:
The photonic integrated circuit serves multiple functions: it acts as both the optical processing platform and a structural wall of the vacuum envelope. This multi-functionality reduces the number of components needed and simplifies the overall device architecture while preserving measurement precision.
2Reliability
If nonplanar waveguides with bridge structures are used to hermetically seal the vacuum envelope, then vacuum integrity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The waveguides incorporate bridge structures with curved or nonplanar geometries that naturally conform to the vacuum envelope surface. These curved structures provide hermetic sealing while being compatible with standard semiconductor fabrication processes, balancing vacuum integrity with manufacturability.
Solution Approach 2:
The bridge structures modify the physical parameters of the waveguide interface, creating a planar bonding surface that maintains hermetic seal while accommodating manufacturing tolerances. The bridge structure geometry is optimized to provide sealing function without requiring ultra-precise manufacturing.
3Volume of moving object
If the PIC forms a wall of the vacuum envelope, then device compactness is improved, but material compatibility challenges arise
Solution Approach 1:
The vacuum envelope is constructed as a composite structure where the PIC (typically silicon-based) forms an integral wall. The anodic bonding process creates a reliable interface between dissimilar materials, enabling compact integration while managing material compatibility through controlled bonding conditions and interface design.
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 configuration maintains high vacuum conditions, reduces contamination, and enhances measurement accuracy by allowing precise light-atom interactions within the vacuum envelope, facilitating easy manufacturing and uniformity of the assembly.
Implementation Method 1
each waveguide is configured to transmit light from a light input surface to an interior of the vacuum envelope
Implementation Method 2
The integration of a vacuum envelope with a photonic integrated circuit (PIC) using anodic bonding
Data Source
AI summary
The disclosure describes vacuum cell assemblies that integrate a vacuum envelope with a photonic integrated circuit (PIC). Walls of the vacuum envelope are coupled to the PIC, such as through anodic bonding, so that the PIC forms at least one wall of the vacuum envelope and provides an optically accessible medium and surface for transmitting and distributing light into various cavities of the vacuum envelope through one or more nonplanar waveguides. A surface of the PIC may include a material that is compatible with a material of the walls of the vacuum envelope, such as a silicon-based vacuum envelope bonded to a silicon nitride or amorphous silicon surface of the PIC. Each waveguide may include a bridge structure that forms a planar surface for tightly bonding with the vacuum envelope and preserves properties of the transmitted light between opposing sections of the waveguide.