Fabry-Perot Mirror Plate Elevated Sensor Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The accuracy of determining mirror spacing in Fabry-Perot interferometers is compromised by large electrode gaps, leading to low capacitance measurements and increased sensitivity to electromagnetic interference, which affects the precision of spectral peak positioning and spectral resolution.
Innovation Solution
The implementation of elevated sensor electrodes supported by a silica layer, which reduces the electrode gap and improves capacitance measurement accuracy by maintaining a stable and parallel support for the electrodes, while also serving as a protective mask during material deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If large electrode gaps are used in Fabry-Perot interferometers, then the device structure is simpler and easier to manufacture, but the capacitance measurement accuracy decreases and sensitivity to electromagnetic interference increases
Solution Approach 1:
The patent introduces a vertical elevation dimension by supporting the sensor electrode on a silica layer, transforming the electrode from a planar configuration to an elevated three-dimensional structure. This dimensional change reduces the electrode gap distance, thereby improving capacitance measurement accuracy without complicating the overall manufacturing process
2Device complexity
If large electrode gaps are used in Fabry-Perot interferometers, then the device structure is simpler, but the sensitivity to electromagnetic interference increases
Solution Approach 1:
By elevating the sensor electrode vertically through silica layer support, the patent reduces the gap distance between electrodes. This dimensional modification decreases the antenna effect and electromagnetic interference sensitivity while adding minimal structural complexity to the device
3Measurement precision
If the electrode gap is reduced, then the capacitance measurement accuracy improves, but the electrode support structure becomes more complex
Solution Approach 1:
The patent introduces a silica layer as an intermediary material between the sensor electrode and the substrate. This intermediary structure serves multiple functions: providing mechanical support for the elevated electrode, reducing the electrode gap, and acting as a protective mask during material deposition, thereby achieving measurement precision improvement without excessive complexity
4Manufacturing precision
If elevated sensor electrodes are implemented, then spectral resolution improves through narrower transmission peaks, but the manufacturing process becomes more complex
Solution Approach 1:
The silica layer supporting the elevated electrode serves multiple functions simultaneously: it provides mechanical support for electrode elevation, acts as a protective mask during material deposition processes, and enables the formation of narrow transmission peaks for improved spectral resolution. This multi-functionality achieves manufacturing precision improvement without proportionally increasing manufacturing complexity
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 approach enhances the accuracy of mirror spacing determination, leading to narrower transmission peaks and improved spectral resolution, while maintaining the interferometer's stability and resistance to electromagnetic interference.
Implementation Method 1
elevated sensor electrodes supported by a silica layer, which reduces the electrode gap and improves capacitance measurement accuracy by maintaining a stable and parallel support for the electrodes
Implementation Method 2
forming one or more capacitive sensor electrodes (90, 90a, 90b) by depositing conductive material on top of the intermediate layers (62)
Implementation Method 3
A Fabry-Perot interferometer comprises a first semi-transparent mirror and a second semi-transparent mirror, which are arranged to form an optical cavity. The Fabry-Perot interferometer may provide one or more transmission peaks.
Implementation Method 4
The interferometer may comprise e.g. a piezoelectric actuator for adjusting the mirror spacing. The piezoelectric actuator may be driven by applying a driving voltage to the actuator
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A method for producing a mirror plate (100) for a Fabry-Perot interferometer (700) may comprise: - providing a base slab (51), which comprises a substrate (50) coated with a reflective multilayer coating (60), - forming one or more intermediate layers (62) on the base slab (51) such that the lowermost intermediate layer (62) substantially consists of silica (SiO2), and such that the multilayer coating (60) is at least partially covered by the lowermost intermediate layer (62), - forming one or more capacitive sensor electrodes (90a, 90b) by depositing conductive material on top of the intermediate layers (62), and - removing material of the lowermost intermediate layer (62) by etching (ETCH1) in order to form an exposed aperture portion (AP1) of the multilayer coating (60).