Low-autofluorescence optical components for confocal microscopy
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Solution Overview
Problem
Confocal microscopes, including those with spinning disks, face issues with stray light reflection and autofluorescence from optical components, which degrade image quality by reducing the signal-to-background ratio and requiring longer exposure times.
Innovation Solution
The use of low-autofluorescence substrates and high-performance anti-reflective coatings on optical components, such as the spinning disk and other optical elements, to minimize stray light and autofluorescence, thereby enhancing image quality and reducing exposure times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional anti-reflective coatings are applied to optical components, then reflectance is reduced, but autofluorescence from the coatings degrades image quality
Solution Approach 1:
The patent changes the material parameters of the optical components by using low-autofluorescence substrates and optimizing coating materials to minimize autofluorescence while maintaining anti-reflective properties. This involves selecting materials with specific optical characteristics that reduce both reflection and autofluorescence simultaneously.
Solution Approach 2:
The patent employs composite material structures combining low-autofluorescence substrate materials with specialized anti-reflective coatings. The composite approach allows each layer to address specific issues: the substrate provides low autofluorescence while the coating provides anti-reflective properties, together resolving the contradiction between reducing reflection and avoiding autofluorescence.
2Measurement precision
If confocal apertures are used to eliminate out-of-focus light, then optical resolution and contrast are improved, but light intensity decreases requiring longer exposure times
Solution Approach 1:
The patent optimizes the aperture parameters and optical component transmission characteristics to maximize light throughput while maintaining confocal resolution. By changing parameters such as aperture size, numerical aperture, and optical material transmission properties, the system achieves better light efficiency without sacrificing the confocal advantage of eliminating out-of-focus light.
3Productivity
If spinning disks with multiple apertures are used for scanning, then imaging speed is increased, but reflectance and autofluorescence from the disk degrade image quality
Solution Approach 1:
The patent changes the material composition and optical properties of the spinning disk to reduce reflectance and autofluorescence. This involves selecting low-autofluorescence materials for the disk substrate and optimizing the aperture geometry to minimize stray light generation while maintaining high imaging speed through rapid rotation.
Solution Approach 2:
The patent applies local quality optimization by treating different regions of the spinning disk with different properties. The aperture regions are designed with specific geometric characteristics to minimize stray light, while the inter-aperture regions are optimized for minimal reflectance. This localized optimization allows the disk to maintain high imaging speed while reducing harmful reflections and autofluorescence from different areas.
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 significantly reduces 'ghost' light in confocal images, improving the signal-to-background ratio, increasing image contrast, and enhancing system throughput by shortening exposure times.
Implementation Method 1
a high-performance anti-reflective layer coating the substrate
Implementation Method 2
autofluorescence exhibited by optical components (i.e., generation of secondary stray light in an optical component). The color centers are due to the presence of rare earth elements and other impurities in the material
Data Source
AI summary
An optical component for a microscope may include a low-autofluorescence substrate, or a substrate and a high-performance anti-reflective layer coating the substrate. An optical component may include a low-autofluorescence substrate and high-performance anti-reflective layer coating the low-autofluorescence substrate. The high-performance anti-reflective layer may be a low-autofluorescence high-performance anti-reflective layer. A microscope may include one or more such optical components.