MINFLUX Sequential Point Illumination with Independent Light Sources
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Solution Overview
Problem
Existing microscopy methods face challenges in achieving fast and flexible sequential illumination of illumination points with sufficient resolution below the diffraction limit, particularly due to limitations in scanner technology such as electro-optic scanners, which are polarization and wavelength dependent, require high power, and have limited deflection angles.
Innovation Solution
A method and apparatus utilizing individual light sources for each illumination point, with a time offset illumination and lateral extent smaller than the illumination light wavelength, allowing for flexible and efficient sequential illumination of an illumination point pattern without the need for complex scanners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electro-optic scanners are used for fast positioning of the illumination focus, then the positioning speed is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The illumination system is segmented into multiple independent light sources, each corresponding to a specific illumination point in the pattern. This eliminates the need for a single complex scanner to move one focus, as each light source independently provides illumination at its designated point without requiring mechanical or electro-optic scanning components.
Solution Approach 2:
Instead of moving a single illumination focus using a scanner, the system creates multiple stationary focus copies at different spatial locations through the use of multiple light sources. Each light source generates a focus at its assigned illumination point, effectively copying the illumination function to multiple fixed positions simultaneously.
2Speed
If electro-optic scanners are used for fast positioning, then the positioning speed is improved, but the power dissipation and heat generation increase
Solution Approach 1:
The system divides the illumination function into multiple independent light sources, each operating at its own stationary position. This eliminates the need for high-power electro-optic scanners that generate significant heat during fast positioning operations, as each light source operates continuously at low power without requiring high-voltage switching or resonant actuation.
Solution Approach 2:
The illumination capability is copied to multiple fixed light sources instead of concentrating the positioning function in a single high-power scanner. This distribution of the illumination function to multiple low-power sources eliminates the heat generation and energy loss associated with fast electro-optic scanning operations.
3Device complexity
If a single light source is scanned to cover all illumination points, then the device complexity is reduced, but the illumination speed and flexibility deteriorate
Solution Approach 1:
The single scanned light source approach is segmented into multiple independent light sources, each dedicated to a specific illumination point. This segmentation enables simultaneous illumination of multiple points without the time loss associated with scanning, thereby improving illumination speed and flexibility while maintaining manageable device complexity through the use of identical modular light source units.
Solution Approach 2:
The functions of multiple light sources are merged into a coordinated system where each source operates independently but contributes to the overall illumination pattern. This merging of multiple simple sources achieves the productivity of simultaneous multi-point illumination while avoiding the complexity of a single complex scanned source system.
4Area of stationary object
If the illumination point pattern has large lateral extent, then more sample area is covered, but the resolution below diffraction limit is compromised
Solution Approach 1:
The illumination pattern is segmented into multiple discrete illumination points with sub-diffraction spacing, each point being smaller than the diffraction limit. This segmentation allows the overall pattern to cover a larger lateral area while maintaining high localization precision at each individual point, as each point source provides sufficient spatial resolution for accurate fluorescence marker 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
Enables accurate and rapid localization of fluorescence markers with increased resolution by ensuring fluorescence markers are illuminated sequentially and without simultaneous overlap, reducing the need for costly and inefficient scanners, and allowing for various intensity distributions and three-dimensional patterns.
Implementation Method 1
a fluorescence marker to be accurately located using a donut-shaped focus of a laser beam used to excite the fluorescence
Data Source
AI summary
A method for punctiform illumination of a sample with a MINFLUX microscope has the sample being sequentially illuminated at illumination points of a predefined or predefinable illumination point pattern. The lateral extent of the illumination point pattern is smaller than the longest wavelength of the illumination light. The illumination points are always illuminated exclusively with a time offset. A distinct individual light source is assigned to each illumination point of the illumination point pattern. Each illumination point is illuminated by the focus of an illumination light bundle of the individual light source.