Multi-Channel Metalens Imaging for Compact High-Resolution Capture
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Solution Overview
Problem
Multi-channel imaging devices face challenges in reducing size and achieving high-resolution imaging due to space constraints in portable electronic devices, and existing solutions like diffractive optics and metalenses often suffer from chromatic aberrations and limited image capture area.
Innovation Solution
The use of multi-channel imaging devices incorporating metalenses, each configured for a specific wavelength or narrow band of wavelengths, combined with low-resolution image sensors and optical filters, allows for compact and high-resolution imaging by leveraging the advantages of metalenses, such as being ultrathin and lightweight, and employing super-resolution reconstruction techniques to combine low-resolution images into high-resolution outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional wide-field microscopes are used to image large areas, then the field of view is increased, but the resolution and signal-to-noise ratio deteriorate
Solution Approach 1:
The patent divides the wide field of view into multiple smaller fields of view, each imaged by a separate high-resolution objective lens. Multiple images are captured sequentially across the entire area and then computationally stitched together to form a composite high-resolution image of the large area, thereby maintaining both wide coverage and high resolution.
Solution Approach 2:
The patent transitions from a single-plane imaging approach to a multi-plane imaging approach by using multiple objective lenses positioned at different heights. This vertical dimensionality allows simultaneous capture of multiple fields of view at different focal planes, which are then combined to achieve both wide area coverage and high resolution.
2Productivity
If multiple objective lenses are used to image multiple fields of view simultaneously, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple objective lenses with different magnifications and focal lengths into a single integrated imaging system. Multiple fields of view are captured simultaneously by these lenses and then merged through computational stitching algorithms, achieving high productivity while managing complexity through software integration rather than mechanical complexity.
Solution Approach 2:
The imaging system is designed with multi-functional objective lenses that can capture multiple fields of view simultaneously at different magnifications. This universal design allows a single system to perform multiple imaging functions (wide-area survey, detailed inspection, and intermediate viewing) without requiring separate dedicated devices for each function.
3Measurement precision
If high-magnification objective lenses are used, then resolution is improved, but the field of view decreases
Solution Approach 1:
The patent segments the overall imaging task into multiple sub-tasks, each handled by a high-magnification objective lens focused on a specific small field of view. By capturing multiple such segmented images across the entire area and stitching them together, the system achieves both high resolution (from individual high-mag lenses) and wide field of view (from the composite image).
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 enables high-resolution imaging with reduced device size and improved image capture efficiency, utilizing metalenses to focus light onto pixel arrays, and super-resolution processing to enhance image quality, suitable for applications in smartphones and various imaging tasks.
Implementation Method 1
a metacircular polarizer to transform linearly polarized light from a light source into circularly polarized light
Implementation Method 2
a first circular dichroic filter to generate a first oppositely circularly polarized light field from a first portion of the circularly polarized light and a second circular dichroic filter to generate a second oppositely circularly polarized light field from a second portion of the circularly polarized light
Data Source
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AI summary
An apparatus includes, in some implementations, at least one image sensor, a plurality of metalenses, and readout and processing circuitry. The at least one image sensor includes a plurality of pixel arrays, each of the which is associated, respectively, with a different one of a plurality of optical channels configured for detection of incoming light rays of a particular wavelength or a particular range of wavelengths centered on the particular wavelength. Each of the metalenses is disposed, respectively, in a different one of the optical channels and is configured, respectively, to focus incoming light rays onto a different one of the pixel arrays. The readout and processing circuitry is operable to read out signals from the pixel arrays and to generate a respective lower-resolution image for each of the optical channels, and to process the lower-resolution images to obtain a higher-resolution monochromatic image. Methods of operation are described as well.