Light Sheet Microscopy Separating Layer System
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Solution Overview
Problem
Light sheet microscopy techniques face challenges with large sample sizes, limited axial resolution due to thick light sheets, complex sample preparation, and incompatibility with standardized sample holders, particularly in high-throughput screening where cross-contamination is a concern.
Innovation Solution
A separating layer system with predetermined thickness and materials is introduced to spatially separate the sample medium from the illumination and detection objectives, minimizing aberrations by optimizing the illumination and detection angles and using corrective means such as lenses or adaptive optical elements to reduce imaging aberrations, and selecting materials with refractive indices close to the sample medium to prevent contamination and improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separating layer system is introduced to prevent cross-contamination between samples, then cross-contamination is prevented and high-throughput analysis is enabled, but imaging aberrations increase due to the additional optical interface
Solution Approach 1:
A separating layer system consisting of a covering and immersion medium is introduced as an intermediary between the sample and the objectives. This mediator prevents direct contact between the objectives and the sample medium, thereby preventing cross-contamination while maintaining optical functionality through carefully selected materials with matched refractive indices
Solution Approach 2:
The refractive indices of the separating layer materials (covering and immersion medium) are specifically selected to match or closely approximate the refractive index of the sample medium. This parameter matching minimizes refraction and imaging aberrations at the optical interfaces, resolving the contradiction between contamination prevention and imaging quality
2Object-affected harmful factors
If the illumination objective and detection objective are positioned at angles not equal to zero with the normal of the reference surface, then light sheet illumination is achieved with reduced photobleaching, but optical aberrations increase due to oblique light paths
Solution Approach 1:
The illumination angle β and detection angle δ are optimized by adjusting the numerical apertures of the objectives and their angular positions. This parameter optimization allows oblique illumination that reduces photobleaching while maintaining acceptable optical resolution through careful balancing of angle and aperture
Solution Approach 2:
The separating layer system acts as an optical mediator that compensates for the aberrations introduced by oblique light paths. The carefully selected materials and thickness of the covering help correct the optical distortions, enabling angled illumination while maintaining image quality
3Length of stationary object
If a thick light sheet is used to illuminate large samples, then penetration depth is increased allowing imaging of thicker samples, but axial resolution deteriorates
Solution Approach 1:
The thickness of the light sheet is dynamically adjusted by changing the numerical aperture of the illumination objective and the angle of illumination. This allows adaptation of the light sheet thickness to match the sample size, enabling deep penetration for large samples while maintaining reasonable axial resolution through parameter optimization
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 high-throughput analysis of multiple samples while preventing cross-contamination and reducing imaging aberrations, allowing for higher axial resolution and compatibility with standard sample holders, including microtiter plates, by optimizing the optical setup and using adaptive corrections.
Implementation Method 1
the illumination angle β and detection angle δ are predetermined based on the numerical aperture NAD of the detection objective and on the numerical aperture NAB of the illumination objective
Implementation Method 2
corrective means for reducing aberrations, particularly aberrations arising as a result of the oblique passage of illumination light and/or of light to be detected through interfaces of the separating layer system
Implementation Method 3
selecting materials with refractive indices close to the sample medium to prevent contamination and improve imaging quality
Data Source
AI summary
An arrangement, for light sheet microscopy, including: a sample vessel, for receiving a medium containing a sample, oriented with respect to a plane reference surface; illumination optics with an illumination objective for illuminating the sample with a light sheet; and detection optics with a detection objective. The optical axis of the illumination objective and the light sheet lies in a plane which forms a nonzero illumination angle with the normal of the reference surface. The detection objective has an optical axis that forms a nonzero detection angle with the normal of the reference surface. The arrangement also includes a separating-layer system for separating the sample-containing medium from the illumination and detection objectives. The separating-layer system contacts the medium with an interface parallel to the reference surface. The illumination angle and detection angle are predetermined based on numerical apertures of the detection objective and of the illumination objective, respectively.