Transparent Microfabricated Vapor Cell Sensor with Intersecting Signal Paths
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Solution Overview
Problem
Microfabricated vapor cell sensors face challenges in achieving two perpendicular signal paths in a small package using the traditional glass/silicon/glass structure, which is difficult to fabricate on a wafer scale in microelectronic fabrication facilities, limiting their performance and sensitivity.
Innovation Solution
An integrated microfabricated vapor cell sensor with a cell body made of transparent material, featuring a cavity with two intersecting signal paths that extend through the cell body and intersect in the cavity, allowing for more sensitive operations such as accurate clock frequency determination and magnetic field measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a glass/silicon/glass structure is used for the cell body, then the sensor can be fabricated on a wafer scale in microelectronic fabrication facilities, but it is difficult to achieve two perpendicular signal paths in a small package
Solution Approach 1:
The patent transitions from a traditional planar glass/silicon/glass structure to a three-dimensional transparent cell body with intersecting signal paths. The first signal path extends through the cell body in one direction while the second signal path intersects it perpendicularly, utilizing spatial dimensionality to accommodate multiple paths within a compact volume. This dimensional approach resolves the contradiction by enabling perpendicular signal paths without compromising wafer-scale fabrication compatibility.
2Ease of manufacture
If a traditional glass/silicon/glass structure is used, then fabrication costs are kept lower through wafer scale production, but the sensor performance and sensitivity are limited
Solution Approach 1:
The patent employs a composite structure consisting of a transparent cell body material combined with integrated transparent plates. This composite approach maintains manufacturability through wafer-scale production of the cell body while the integrated transparent plates enable enhanced optical path configurations. The composite structure achieves both cost-effectiveness and improved sensor sensitivity by supporting multiple intersecting signal paths within the same fabrication framework.
3Adaptability or versatility
If the cell body is made of transparent material with integrated transparent plates, then two intersecting signal paths can be achieved, but the device complexity increases
Solution Approach 1:
The patent merges the transparent plates with the cell body structure to form an integrated unit. Rather than assembling separate components, the transparent plates are integrated directly into the transparent cell body, creating a unified structure that supports intersecting signal paths. This merging approach reduces device complexity by eliminating the need for separate mounting and alignment of discrete plates, while still achieving the desired multi-path functionality.
Data Source
AI summary
An integrated microfabricated vapor cell sensor includes a transparent sensor cell body. The cell body has a cavity for a sensor fluid vapor which is covered by a first plate attached to the cell body. The sensor has a first signal path extending from a first signal emitter, through the cell body, through the cavity, through the cell body again, and to a first signal detector, and a second signal path extending through the cavity. The second signal path intersects the first signal path in the cavity. The second signal path may extend through the cell body, or may extend through the first plate. The signal emitters and signal detectors are located in the integrated microfabricated vapor cell sensor.