TIRF Microscopy Transition Element Aberration Correction
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Solution Overview
Problem
Current TIRF microscopy systems face challenges in correcting aberrations caused by oblique passage of radiation through specimen holders with different refractive indices, leading to imaging issues and reduced resolution.
Innovation Solution
An arrangement with a transition element, such as a meniscus lens or virtual relay, is introduced between the specimen carrier and objectives, using an immersion medium with a refractive index matching the specimen carrier to correct aberrations and ensure accurate total-internal reflection microscopy, while allowing for adjustable illumination and detection angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oblique illumination and detection angles are used for TIRF microscopy, then surface sensitivity and evanescent field penetration are improved, but aberrations increase due to refraction at interfaces with different refractive indices
Solution Approach 1:
An immersion medium with refractive index matching the specimen carrier is introduced as an intermediary substance between the objectives and the specimen carrier. This mediator eliminates refractive index mismatches that cause aberrations, allowing oblique illumination angles to achieve high surface sensitivity without compromising imaging quality.
Solution Approach 2:
The refractive index parameter of the immersion medium is specifically adjusted to match that of the specimen carrier. By changing this physical parameter, the system eliminates refraction-induced aberrations while maintaining the beneficial oblique illumination geometry for enhanced surface sensitivity.
2Device complexity
If standard specimen holders are used without refractive index matching, then device complexity is reduced, but aberrations occur leading to reduced resolution
Solution Approach 1:
The refractive index of the immersion medium is adjusted to match the specimen carrier material. This parameter change eliminates the need for complex correction optics while maintaining high resolution, thus preserving system simplicity without sacrificing imaging quality.
Solution Approach 2:
The refractive index mismatch, which initially causes harmful aberrations, is converted into a beneficial condition by deliberately selecting an immersion medium whose refractive index matches the specimen carrier. This transforms the potential problem into a solution that simplifies the optical system while maintaining high resolution.
3Manufacturing precision
If refractive index matching is implemented between immersion medium and specimen carrier, then aberrations are corrected and resolution is improved, but device complexity increases due to additional optical components
Solution Approach 1:
The immersion medium serves as a simple intermediary substance that corrects aberrations through refractive index matching alone, without requiring additional complex optical components such as correction lenses or adaptive optics systems.
Solution Approach 2:
By adjusting the refractive index parameter of the immersion medium to match the specimen carrier, the system achieves aberration correction through a single material parameter change, avoiding the need for multiple corrective optical elements and maintaining system simplicity.
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 significantly reduces aberrations and improves imaging quality by matching the refractive indices of the immersion medium with the specimen carrier, enhancing the resolution and accuracy of TIRF microscopy, particularly in inverted light sheet microscopy setups.
Implementation Method 1
The illumination beam path is directed into the specimen region of the specimen plane at an illumination angle which is suitable for producing total-internal reflection of the illumination radiation at the specimen plane
Implementation Method 2
the transition element is embodied to correct aberrations which arise on account of the passage through media with different refractive indices of radiation to be detected and/or of radiation for illuminating the specimen
Implementation Method 3
an evanescent illumination, also referred to as TIRF field, as evanescent wave or as evanescent field, is coupled into at least one region of the specimen
Implementation Method 4
If the specimen contains molecules that are excitable to emit detection radiation, for example fluorescence, by the light (illumination radiation) of the evanescent field
Data Source
AI summary
An arrangement for TIRF microscopy, having an illumination optical unit with an illumination objective for illuminating a specimen on a specimen carrier in a specimen plane via an illumination beam path. An optical axis of the illumination objective includes an illumination angle that differs from zero with the normal of the specimen plane. A detection optical unit with a detection objective in a detection beam path includes a detection angle that differs from zero between an optical axis thereof and the normal of the specimen plane. A transition element between the specimen carrier and both objectives is arranged both in the illumination beam path and in the detection beam path. The transition element corrects aberrations that arise on account of the passage through media with different refractive indices of radiation to be detected and/or radiation for illuminating the specimen.