Lensless Microscopy Near-Field Imaging Resolution
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Solution Overview
Problem
Conventional optical microscopy is limited by the diffraction limit, which restricts resolution to several hundred nanometers due to the wave properties of light, making it difficult to achieve high-resolution imaging of specimens without the use of complex lenses or computational corrections.
Innovation Solution
An imaging device with a high-resolution photosensitive array and supporting circuitry that allows specimens to be placed within half a pixel width of the photosensitive surface, achieving near-field imaging that surpasses the classical diffraction limits without the need for lenses or computational corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical microscopy is used, then the imaging system is simple and easy to operate, but the resolution is limited to several hundred nanometers by the diffraction limit
Solution Approach 1:
The patent extracts and removes the lens component from the optical system, replacing it with a lensless imaging approach that uses a photosensitive array positioned in near-field contact with the specimen. This eliminates diffraction limitations while simplifying the overall device structure.
Solution Approach 2:
The patent positions the photosensitive array in direct near-field contact with the specimen, nesting the detection element within the diffraction-limited optical path. This allows the array to capture evanescent waves and near-field information that would otherwise be lost, achieving super-resolution without complex external optics.
2Measurement precision
If lensless microscopy methods are used to overcome the diffraction limit, then high-resolution imaging is achieved, but multiple images must be integrated or computational image derivation is required
Solution Approach 1:
The patent performs preliminary action by positioning the photosensitive array in near-field contact with the specimen before imaging occurs. This pre-positioning captures the near-field optical information directly at the source, eliminating the need for subsequent computational image derivation or multiple image integration.
3Measurement precision
If standard optical microscopy is used, then the device is simple and inexpensive, but the resolution seldom achieves below 0.5 μm due to lens aberrations
Solution Approach 1:
The patent extracts the lens component that introduces aberrations and replaces it with a lensless near-field imaging configuration. This eliminates the source of optical aberrations while maintaining manufacturing simplicity through the use of standard photosensitive arrays.
4Measurement precision
If near-field scanning optical microscopes are used, then the diffraction limit is overcome, but the probe must be scanned along the specimen surface
Solution Approach 1:
The patent merges the photosensitive array directly with the specimen surface in near-field contact, combining the detection element with the imaging target. This eliminates the need for scanning motion while maintaining near-field resolution, thereby significantly improving imaging speed and productivity.
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
Enables high-resolution imaging of specimens, exceeding the resolution of standard optical microscopes, with broad applicability and simplicity, suitable for various applications including moving or changing specimens, without the requirement for expensive optical elements.
Implementation Method 1
an imaging device has a photosensitive array of pixels... signals generated by the photosensitive array are used to produce a high resolution image of the specimen
Data Source
AI summary
Among other things, an imaging device has a photosensitive array of pixels, and a surface associated with the array is configured to receive a specimen with at least a part of the specimen at a distance from the surface equivalent to less than about half of an average width of the pixels.