Fabry-Perot Resonators with Non-Circular Posts for Polarization Spectrometry
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Solution Overview
Problem
Current optical devices and spectrometers face challenges in efficiently measuring spectral intensities of different polarization components of incoming light, requiring multiple polarization filters and complex setups to differentiate between resonance wavelengths of various polarization components.
Innovation Solution
The optical device employs a combination of distributed Bragg reflector layers with non-circular post arrays between them, forming Fabry-Perot resonators that differentiate resonance wavelengths of different polarization components, allowing for the measurement of intensity sums at various frequencies, enabling the computation of individual polarization component intensities without additional polarization filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple polarization filters are used to measure spectral intensities of different polarization components, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple polarization measurement functions into a single integrated device. The optical device integrates a first set of resonators for first polarization components and a second set of resonators for second polarization components, eliminating the need for separate polarization filters and their mechanical manipulation systems. This merging reduces device complexity while maintaining the capability to measure spectral intensities of different polarization components.
Solution Approach 2:
The optical device achieves multi-functionality by enabling simultaneous measurement of spectral intensities for multiple polarization components through a single device configuration. The resonators are designed to respond to different polarization components with different resonance wavelengths, allowing the device to perform multiple polarization-resolved spectral measurements without requiring multiple separate filters or sequential measurements.
2Adaptability or versatility
If polarization filters are rotated or exchanged to measure different polarization components, then measurement flexibility is improved, but ease of operation deteriorates
Solution Approach 1:
The patent merges multiple polarization measurement capabilities into a fixed, integrated optical device. Instead of requiring rotation or exchange of polarization filters, the device incorporates multiple resonator sets with different orientations that simultaneously respond to different polarization components. This eliminates manual manipulation operations while maintaining the ability to measure multiple polarization components.
3Measurement precision
If additional polarization filters are added to the system, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The resonators in the optical device serve multiple functions simultaneously. Each resonator is designed to resonate at specific wavelengths for specific polarization components, effectively acting as both the filtering element and the measurement probe. This self-service approach eliminates the need for additional separate polarization filters, reducing device complexity while maintaining measurement accuracy through the resonators' inherent polarization-selective resonance properties.
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 solution allows for compact, efficient measurement of spectral intensities of different polarization components, reducing the need for multiple filters and enhancing measurement accuracy by limiting the number of resonance frequencies, thus simplifying the spectrometer system and improving resolution.
Implementation Method 1
the reflector layers 12a,b and an intermediate layer 14... forming Fabry-Perot resonators that differentiate resonance wavelengths of different polarization components
Implementation Method 2
reflector layers 12a,b... comprising a plurality of sub layers 120, 122 of optically transparent materials having different indexes of refraction, forming a distributed Bragg reflector
Implementation Method 3
arrays of posts 14a of a second material embedded in the first material... used to differentiate the resonance wavelengths of different polarization components
Data Source
Figure 1~2b
Figure 2c~2f
Figure 3~4
AI summary
The optical device comprises a group of Fabry -Perot resonators, formed by a stack of a first and second partial reflection layer and an intermediate layer between the first and second partial reflection layer. The intermediate layer comprises a dielectric material and a group of arrays of posts embedded in the dielectric material at different positions along the intermediate layer. Each array in the group contains posts of a different non-circular shape and/or orientation in cross-section with a plane parallel to the reflection layers. As a result, Fabry -Perot resonators are formed in areas that contain different arrays, each having first and second resonance peaks at mutually different resonance frequencies for different polarization components. Light intensity sensors may be provided located below the different areas. From the intensities measured by the sensors, the intensities of different polarization components of the light can be computed over a range of wavelengths.