Light-Sheet Illumination Polarization Splitting for Streak Artifact Reduction
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Solution Overview
Problem
Conventional light-sheet fluorescence microscopy experiences streak artifacts due to scattering or absorption within the sample, and existing solutions like dual illumination paths or adjustable deflection elements are costly, complex, or limited in application.
Innovation Solution
An apparatus with a polarization element that splits the illumination beam into two differently polarized sub-beams, which propagate at different angles, ensuring that if one direction is shaded by a scattering center or absorber, the other direction maintains sufficient illumination, thereby avoiding streak artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single illumination beam path is used, then the device complexity is reduced, but streak artifacts occur due to scattering or absorption
Solution Approach 1:
The single illumination beam is segmented into multiple sub-beams with different propagation directions using a polarization element (e.g., beam splitter or polarizing prism). These sub-beams illuminate the sample from different angles, ensuring that if one path encounters scattering or absorption, other paths can compensate, thereby reducing streak artifacts while maintaining a relatively simple single-beam-path architecture.
Solution Approach 2:
Different regions of the illumination beam are given different propagation directions and polarization states. The polarization element creates sub-beams with distinct local properties (directions), allowing selective illumination from multiple angles through a single optical path, thus eliminating streak artifacts without requiring multiple complete illumination systems.
2Object-affected harmful factors
If two separate illumination beam paths are used, then streak artifacts are reduced, but the device complexity and cost increase
Solution Approach 1:
Multiple illumination functions (multiple beam paths with different directions) are merged into a single illumination system. The polarization element divides one illumination beam into multiple sub-beams that propagate in different directions, combining the benefits of multi-directional illumination with the simplicity of a single illumination source and optical path.
Solution Approach 2:
A single illumination beam path is made multi-functional by using a polarization element to generate multiple sub-beams with different propagation directions. This single system performs the function of multiple illumination paths, reducing device complexity while maintaining the ability to reduce streak artifacts through multi-directional illumination.
3Object-affected harmful factors
If an adjustable deflection element is used, then multiple incidence directions are achieved, but the device complexity and cost increase
Solution Approach 1:
The mechanical deflection system (galvanometer or movable mirror) is replaced with a polarization-based beam splitting system. Instead of mechanically adjusting the beam direction, a polarization element statically divides the beam into multiple directions based on polarization states, eliminating the need for expensive and complex high-speed mechanical components while achieving multi-directional illumination.
4Object-affected harmful factors
If a cylindrical lens array is used, then multiple laterally offset light-sheets are generated, but interference artifacts occur due to reduced coherence
Solution Approach 1:
Instead of using a cylindrical lens array that creates laterally offset light-sheets with reduced coherence, the invention changes the parameter of beam separation by using polarization-based splitting. This creates sub-beams with different propagation directions while maintaining coherence, avoiding interference artifacts and preserving image quality while still reducing streak artifacts.
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 effectively reduces streak artifacts while maintaining technical simplicity and compatibility with single-objective systems like SPIM, without the need for multiple illumination objectives or high-speed deflection elements, enhancing imaging quality.
Implementation Method 1
A polarization element is arranged in a position conjugated to the focal plane between the focusing system and the imaging optical unit and is configured to split the illumination beam into two differently polarized sub-beams
Implementation Method 2
a focusing system for focusing the illumination light beam to form a light-sheet-like illumination light distribution
Implementation Method 3
An imaging optical unit is configured to image the light-sheet-like illumination light distribution into the focal plane of the sample
Implementation Method 4
it may result, by means of scattering centers or absorbers within the sample, in the scattering or absorption of the illumination light
Implementation Method 5
it may result, by means of scattering centers or absorbers within the sample, in the scattering or absorption of the illumination light
Data Source
AI summary
An apparatus for light-sheet-like light illumination of a sample includes a light source configured to generate an illumination beam. A focusing system is configured to focus the illumination beam to form a light-sheet-like illumination light distribution, with which a focal plane of the sample can be illuminated. An imaging optical unit is configured to image the light-sheet-like illumination light distribution into the focal plane. A polarization element, arranged in a position conjugated to the focal plane between the focusing system and the imaging optical unit, is configured to split the illumination beam into two differently polarized sub-beams, which propagate into the imaging optical unit in different propagation directions, whereby the light-sheet-like illumination light distribution can be imaged by the imaging optical unit in the form of two differently polarized light-sheets, which from a same side of the focal plane are superimposed on each other in the focal plane.