Light-Deflection Elements for Oblique Illumination in Microscopy
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Solution Overview
Problem
Conventional light-sheet microscopy has limitations in detecting a wide range of spatial frequencies due to oblique detection planes, leading to scattering and shadowing artifacts. Additionally, existing rotational devices are not compatible with conventional sample formats like Petri dishes or multi-well plates, and image-field rotation systems are prone to alignment issues.
Innovation Solution
The optical system for a light-sheet microscope incorporates transporting optics with an interchanging system that includes a first and second light-deflection element. These elements switch the illumination direction by causing partial and complete image inversions, respectively, allowing for oblique illumination and improved detection capabilities without the need for complex rotational devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If oblique-plane detection is used, then compatibility with conventional sample formats is improved, but detection of spatial frequencies is limited
Solution Approach 1:
The patent employs dynamic switching between different detection plane orientations (oblique and perpendicular) and multiple illumination directions, allowing the system to adapt to different sample formats while maintaining comprehensive spatial frequency detection capability
Solution Approach 2:
The system introduces temporal dimension by alternating between different detection configurations and uses multiple illumination directions to compensate for the limited angular range of oblique-plane detection, achieving complete spatial frequency coverage
2Illumination intensity
If light sheet propagates through sample region, then illumination is achieved, but scattering and shadowing artifacts occur
Solution Approach 1:
The patent uses oblique-plane detection geometry where the detection plane is tilted relative to the sample, which inverts the problem by detecting from an angle that avoids the illumination path, thereby reducing scattering and shadowing artifacts while maintaining illumination effectiveness
3Adaptability or versatility
If rotational devices are used for multi-directional detection, then detection from multiple directions is enabled, but device complexity increases
Solution Approach 1:
Instead of using a single complex rotational device, the patent segments the detection function into multiple fixed detection planes and uses sequential illumination from different directions, achieving multi-directional detection capability with simpler, more reliable components
Solution Approach 2:
The patent replaces mechanical rotational devices with an optical system that uses beam steering and multiple fixed detection planes, eliminating the need for complex mechanical rotation while achieving the same multi-directional detection capability
4Adaptability or versatility
If image-field rotation systems are used, then detection direction can be changed, but alignment precision deteriorates due to bearing tolerances
Solution Approach 1:
The patent replaces mechanical image-field rotation systems with an optical beam steering approach using deflecting elements, which eliminates the need for precision mechanical bearings and prism surfaces, thereby maintaining pupil-imaging centering alignment without tolerance issues
Solution Approach 2:
The patent introduces beam steering elements as intermediaries to change detection direction without physically rotating the detection optics, thereby avoiding alignment issues associated with mechanical rotation while maintaining optical precision
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 solution enables efficient switching of illumination and detection directions in a light-sheet microscope, improving the detection of spatial frequencies and reducing artifacts, while also being compatible with conventional sample formats, thus enhancing the imaging quality and versatility of the microscope.
Implementation Method 1
The first light-deflection element causes a partial image inversion in only one direction. The second light-deflection element causes a complete image inversion in two directions
Data Source
AI summary
An optical system for a light-sheet microscope comprises transporting optics configured to project, into a sample, a light sheet for illuminating a sample plane positioned obliquely to an optical axis of the transporting optics and to project the illuminated sample plane into an intermediate image space. The transporting optics comprises an interchanging system that includes a first light-deflection element and a second light-deflection element. The interchanging system is configured to switch an illumination direction along which the light sheet illuminates the sample by alternately introducing the first light-deflection element and the second light-deflection element into a beam path of the transporting optics. The first light-deflection element causes a partial image inversion in only one direction. The second light-deflection element causes a complete image inversion in two directions.