3D Interferometric Microscopy Sub-Diffractive Localization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current microscopy techniques face challenges in achieving high-resolution, three-dimensional imaging of cellular structures, particularly in determining the precise 3D locations of proteins at a nanometer scale, as existing methods are limited in molecular specificity and resolution.
Innovation Solution
The implementation of a multi-phase interferometric microscopy system that optically actuates an optical source to emit beams in various propagation directions, interferes these beams, and uses wavefront modifications to determine the position of optical sources in three orthogonal dimensions with sub-diffractive accuracy, allowing for simultaneous measurement of position information in all three dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light microscopy techniques are used to image cellular structures, then molecular specificity is maintained, but resolution is limited to above the diffraction limit
Solution Approach 1:
The patent transitions from conventional two-dimensional imaging to three-dimensional interferometric imaging by introducing a temporal dimension through multiple phase measurements. By capturing images at different optical path differences (phase steps) and combining them, the system achieves super-resolution in 3D space, overcoming the diffraction limit while maintaining molecular specificity through fluorescent labeling.
Solution Approach 2:
The system varies the optical path difference parameter between reference and sample beams across multiple measurements (phase stepping). By changing this parameter systematically and combining the results, the system extracts sub-diffraction position information that cannot be obtained from a single conventional image, thereby improving resolution without sacrificing molecular specificity.
2Measurement precision
If interferometric microscopy is used to achieve high-resolution 3D imaging, then measurement precision improves, but device complexity increases
Solution Approach 1:
The microscopy system integrates multiple functions into a unified interferometric platform: it performs conventional imaging, phase-stepping interferometry, and 3D localization simultaneously. The same optical path and detectors used for standard microscopy are adapted to also capture interferometric phase information, reducing the need for separate specialized equipment while achieving high-resolution 3D imaging.
3Measurement precision
If multiple phase measurements are taken to determine 3D position, then measurement precision improves, but loss of time increases
Solution Approach 1:
The system continuously acquires multiple phase-stepped images in rapid succession without interrupting the imaging process. By maintaining continuous illumination and detection while systematically varying the optical path difference, the system collects all necessary phase information in an uninterrupted sequence, minimizing time loss despite multiple measurements being required for high-precision 3D localization.
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 enables the production of three-dimensional renderings with resolution better than conventional optical microscopy, allowing for precise localization of fluorescently labeled proteins in cells with full 3D location accuracy, overcoming the limitations of existing techniques.
Implementation Method 1
Two or more optical beams emitted from the optical source are interfered with each other to produce a plurality of output beams directed to a plurality of detectors
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A statistically sparse subset of switchable optical sources in a sample (S) is activated, and the activated switchable optical sources are excited such that optical beams are emitted from the activated switchable optical sources along at least two optical paths (132, 142). A first wavefront modification in a first optical beam emitted from the activated switchable optical sources along a first optical path is introduced and a second wavefront modification in a second optical beam emitted from the activated switchable optical sources along a second optical path is introduced, the second wavefront modification being distinct from the first wavefront modification. The first and second optical beams are interfered with each other to produce a plurality of output beams (152, 154) and three-dimensional position information of the optical sources is determined based on an intensity of each output beam from the plurality of output beams.