3D Printed Glass Lightguide Array for Snapshot Hyperspectral Imaging
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Solution Overview
Problem
Current snapshot hyperspectral imaging technologies face challenges in achieving high spatial and spectral resolution due to limitations in light efficiency, spatial resolution, and fabrication complexity, particularly with organic polymer optics, which degrade over time and have poor thermal and chemical stability.
Innovation Solution
Utilizing 3D printed glass lightguide arrays with curved input and output ends to sample the intermediate image plane at high resolution, eliminating the need for cladding layers and allowing for compact, efficient spectral information capture without field curvature correction, using a two-photon polymerization process with liquid silica resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic polymer optics are used in snapshot hyperspectral imaging, then fabrication flexibility is improved, but reliability and stability deteriorate due to degradation over time and poor thermal/chemical stability
Solution Approach 1:
The patent uses glass-filled polymer composite materials that combine the fabrication flexibility of polymers with the thermal and chemical stability of glass. The glass particles are dispersed within the polymer matrix to create a composite that exhibits both ease of manufacturing through conventional polymer processing methods and enhanced reliability through the stabilizing effect of glass inclusions.
Solution Approach 2:
The patent modifies the material composition parameters by incorporating varying concentrations of glass fillers into the polymer matrix. This parameter change transforms the material properties, maintaining the polymer's formability while introducing the thermal and chemical stability characteristics of glass, thereby resolving the contradiction between ease of manufacture and reliability.
2Reliability
If conventional fiber arrays with cladding layers are used, then light propagation is improved, but manufacturing precision deteriorates due to difficulty in achieving tight tolerances
Solution Approach 1:
The patent extracts and removes the cladding layer from the fiber structure, transitioning to a claddingless fiber design. This extraction eliminates the complex multi-layer structure that is difficult to manufacture with tight tolerances, while maintaining effective light propagation through the simplified single-material fiber structure.
Solution Approach 2:
The patent applies local quality by creating regions of different refractive indices within the fiber core itself, rather than relying on a separate cladding layer. This localized modification of optical properties within the fiber structure achieves effective light guidance while simplifying the overall manufacturing process and reducing tolerance requirements.
3Ease of manufacture
If flat lightguide arrays are used, then fabrication simplicity is improved, but measurement precision deteriorates due to field curvature requiring complex corrections
Solution Approach 1:
The patent introduces curvature into the lightguide array structure, transforming it from a flat planar array to a curved or three-dimensional configuration. This curvature compensates for field curvature effects in the optical system, improving spatial resolution and measurement precision while maintaining relative fabrication simplicity through the use of flexible polymer materials that can be formed into curved shapes.
Solution Approach 2:
The patent transitions from a two-dimensional flat lightguide array to a three-dimensional curved array structure. This dimensional change allows the lightguides to follow curved paths and accommodate field curvature, thereby improving measurement precision without requiring complex post-fabrication correction systems.
4Measurement precision
If high-resolution sampling is achieved, then measurement precision is improved, but device complexity increases due to larger detector arrays required
Solution Approach 1:
The patent uses curved and three-dimensional lightguide arrangements to spatially compress and remap the light paths, allowing high-resolution sampling to be achieved with a more compact detector array. The curved geometry enables efficient packing and routing of lightguides, reducing the overall detector array size while maintaining high measurement precision.
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
Achieves high spatial and spectral resolution with minimal crosstalk and a small footprint, simplifying optical systems by eliminating the need for complex field curvature corrections and leveraging the superior optical properties of glass optics.
Implementation Method 1
Each lightguide includes a material that allows propagation of light from the input facet to the output facet without a cladding layer
Implementation Method 2
using a two-photon polymerization process with liquid silica resin
Data Source
AI summary
High-resolution compact snapshot hyperspectral imaging devices and methods for producing such devices are described. One example lightguide array device includes a plurality of lightguides configured as a three-dimensional structure having an input and an output end. Each lightguide extends from the input end to the output end and has an input facet that receives light and an output facet. The input facets of the lightguides form a first two-dimensional array at the input end of the three-dimensional structure with no spacing or a first spacing between each of the lightguides. The output facets of the lightguides form a second two-dimensional array at the output end of the three-dimensional structure with a second spacing between each of the lightguides that is larger than the spacing of the first three-dimensional array. At least one of the input end or the output end is shaped as a curved surface.