Scan-less Confocal Microscope Dispersion Grating Resolution
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Solution Overview
Problem
Conventional confocal microscopes are costly and lack compactness, and their scan-less configurations suffer from degraded lateral resolution due to non-optimal grating arrangements, which affects the quality of diagnostic images, especially when wider detection slits are used to enhance signal and reduce noise.
Innovation Solution
A scan-less confocal microscope design with strategically positioned dispersion elements, such as diffraction gratings, ensures that each pixel on the detector is conjugate to a single point on the sample, maintaining high lateral resolution even with wider detection slits by aligning the angles of incidence and exit for each spectral component, thereby optimizing the point spread function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a scan-less confocal microscope uses wider detection slits to enhance signal and reduce noise, then signal-to-noise ratio is improved, but lateral resolution is degraded
Solution Approach 1:
The patent changes the angular parameters of the dispersion elements (diffraction gratings) to satisfy specific conjugate relationships. By adjusting the angles of incidence and exit for each spectral component, the system maintains a narrow effective point spread function even with wider detection slits, thus preserving lateral resolution while allowing increased signal throughput
Solution Approach 2:
The patent employs asymmetric positioning of the diffraction gratings where the angle of incidence does not equal the angle of exit for the broadband light. This asymmetric configuration, combined with spectral dispersion, creates a mapping where each detector pixel corresponds to a single lateral position on the sample, preventing resolution degradation that would normally occur with wider slits
2Device complexity
If conventional confocal microscopes use traditional grating arrangements, then device complexity is reduced, but lateral resolution is degraded due to non-optimal positioning
Solution Approach 1:
The patent modifies the angular parameters and positioning of the diffraction gratings to satisfy specific conjugate relationships. The first grating disperses light at a first angle, and the second grating receives and redirects light at a second angle, creating precise one-to-one mapping between detector pixels and sample points. This parameter optimization achieves high resolution without significantly increasing device complexity
Solution Approach 2:
The patent replaces the traditional mechanical scanning system with a scan-less configuration using diffraction gratings for spectral dispersion and spatial mapping. This substitution eliminates moving scanning components while achieving high lateral resolution through optical parameter optimization, thereby reducing mechanical complexity while improving resolution
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 design maintains high lateral resolution across varying detection slit widths, significantly reducing resolution degradation and enabling cost-effective, high-quality imaging suitable for clinical applications like skin disease diagnosis and cellular imaging.
Implementation Method 1
a first dispersion element positioned to receive a light beam and to produce illumination beams having different spectral components
Implementation Method 2
a second dispersion element positioned to receive the reflected light after propagation through the objective lens
Implementation Method 3
an objective lens positioned to receive reflected light from the target upon reflection of the illumination beams from the target
Data Source
AI summary
Devices, systems and methods are described that can be used to develop confocal microscopes with high lateral resolution. One example confocal microscope includes a first dispersion element that receives a light beam and to produce illumination beams with different spectral components, and an objective that receives reflected light upon reflection of the illumination beams from a target. The confocal microscope further includes a second dispersion element that receives the reflected light after propagation through in the objective lens, and a third dispersion element that receives the dispersed light associated with the second dispersion element and provides an output light to a camera lens for focusing onto a detector. The second and the third dispersion elements are positioned such that each point on the detector is conjugate to a corresponding single point on the target. Some applications of the disclosed confocal microscopes include skin disease diagnosis and imaging of freshly-excised tissues.