Resonant Filter Array Layout for Uniform Hyperspectral Detection
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Solution Overview
Problem
Existing hyperspectral cameras face challenges in achieving high spatial resolution while utilizing multiwavelength information due to nonuniformity in peak intervals and line widths of transmission spectra, and fabrication issues with organic materials and conventional Fabry-Perot filters.
Innovation Solution
A photodetection device with a filter array comprising alternating dielectric layers in reflective layers, each with varying refractive indices and thicknesses, to achieve uniformity in wavelength detection and improve resolution, using dielectric multi-layer films in Fabry-Perot filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional Fabry-Perot filters with organic materials are used, then multiwavelength information can be acquired, but fabrication precision and uniformity of transmission spectra deteriorate
Solution Approach 1:
The patent changes the material parameter from organic materials to inorganic dielectric materials, and adjusts the thickness parameters of individual layers to achieve uniform transmission spectra. By controlling the refractive index and thickness of each dielectric layer, the patent resolves the fabrication precision issue while maintaining multiwavelength detection capability
Solution Approach 2:
The patent uses composite dielectric multi-layer structures combining multiple inorganic dielectric materials with different refractive indices. This composite approach replaces problematic organic materials with a stable inorganic composite structure that provides both manufacturing precision and uniform spectral characteristics
2Measurement precision
If conventional Fabry-Perot filters are used, then spectral information can be detected, but spatial resolution deteriorates due to nonuniform peak intervals
Solution Approach 1:
The patent applies local quality by making each dielectric layer have specific optimized thickness values rather than uniform thickness. By adjusting the local thickness of individual dielectric layers, the patent achieves uniform peak intervals across the spectrum, thereby improving spatial resolution while maintaining spectral detection precision
Solution Approach 2:
The patent changes the thickness parameters of dielectric layers to achieve uniform transmission peak intervals. This parameter optimization resolves the contradiction between spectral detection precision and spatial resolution by ensuring uniformity across the detection field
3Manufacturing precision
If dielectric multi-layer films with varying thickness are used, then uniformity in wavelength detection is improved, but device complexity increases
Solution Approach 1:
The patent segments the reflective layers into multiple thin dielectric layers with varying thicknesses. This segmentation approach achieves uniform wavelength detection by controlling individual layer thicknesses while maintaining an overall structured design that manages complexity through modular construction
4Adaptability or versatility
If organic materials are used in Fabry-Perot filters, then multiwavelength detection is enabled, but fabrication ease deteriorates
Solution Approach 1:
The patent changes the material composition from organic to inorganic dielectric materials, which have better fabrication characteristics. This material substitution maintains multiwavelength detection capability while significantly improving ease of manufacture through standard semiconductor fabrication processes
Solution Approach 2:
The patent employs composite inorganic dielectric materials that can be deposited using conventional thin-film techniques. This composite material approach replaces difficult-to-fabricate organic materials with easily manufactured inorganic alternatives while preserving the multiwavelength detection function
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 device enhances wavelength resolution by reducing nonuniformity in peak intervals and line widths, enabling multiwavelength image acquisition with improved spatial resolution and fabrication ease compared to organic materials and conventional filters.
Implementation Method 1
an intermediate layer between the first reflective layer and the second reflective layer and having a resonant structure having a plurality of resonant modes differing in order from each other
Implementation Method 2
The first reflective layer includes a plurality of first dielectric layers each having a first refractive index and a plurality of second dielectric layers each having a second refractive index that is higher than the first refractive index
Implementation Method 3
The plurality of first dielectric layers and the plurality of second dielectric layers are alternately disposed in the first reflective layer
Implementation Method 4
an image sensor disposed at a position where the image senor receives light having passed through the filter array
Data Source
AI summary
A photodetection device includes: a filter array including a plurality of filters arranged in a two-dimensional array, the plurality of filters including a first filter and a second filter, the first filter and the second filter each including a first reflective layer, a second reflective layer, and an intermediate layer between the first reflective layer and the second reflective layer and having a resonant structure having a plurality of resonant modes differing in order from each other, at least one selected from the group consisting of a refractive index and a thickness of the intermediate layer of the first filter being different from the at least one selected from the group consisting of a refractive index and a thickness of the intermediate layer of the second filter; and an image sensor disposed at a position where the image senor receives light having passed through the filter array.