Laser Scanning Structured Illumination Microscopy Resolution
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Solution Overview
Problem
Conventional optical microscopes are limited by the diffraction limit, preventing the resolution of structures smaller than half the wavelength, which hinders the observation of biological samples and molecular processes.
Innovation Solution
Laser scanning structured illumination microscopy and tomography (LSSIM/T) modulates laser scanning illumination temporally to create a controllable spatial pattern, shifting high spatial frequencies into a detectable range, thereby achieving sub-diffractional resolution beyond the conventional limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical microscopy is used, then the system is simple and easy to operate, but the resolution is limited by the diffraction limit to approximately 9.6 μm
Solution Approach 1:
The patent applies periodic action by modulating the laser scanning illumination temporally at specific frequencies to create controllable spatial patterns. This temporal modulation is translated into spatial frequency shifts that extend the detectable range beyond the diffraction limit, achieving sub-diffractional resolution of 5.5 μm while maintaining system simplicity
Solution Approach 2:
The patent changes the temporal modulation frequency parameter of the laser scanning illumination to control the spatial pattern and achieve different resolution levels. By adjusting the modulation frequency, the system shifts high spatial frequencies into the detectable range, resolving structures below the conventional diffraction limit without increasing device complexity
2Measurement precision
If laser scanning structured illumination microscopy is used to achieve sub-diffractional resolution, then lateral resolution is enhanced by a factor of two, but the system complexity increases
Solution Approach 1:
The patent introduces dynamics by temporally modulating the laser scanning illumination rather than using static illumination patterns. This dynamic modulation allows the system to create controllable spatial patterns that shift spatial frequencies, achieving enhanced lateral resolution of 5.5 μm while using the same basic laser scanning hardware without adding complex optical components
3Measurement precision
If conventional optical microscopy is used, then the depth of focus is maintained, but structures smaller than the diffraction limit cannot be resolved
Solution Approach 1:
The patent transitions from spatial domain imaging to temporal-frequency domain imaging by modulating the illumination temporally. This dimensionality change allows high spatial frequencies to be shifted into the detectable range through temporal modulation, recovering sub-diffractional structure information that would otherwise be lost, achieving 5.5 μm resolution while maintaining the original optical path and depth of focus
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 enhances lateral resolution by a factor of two, allowing for the visualization of structures as small as 5.5 μm, surpassing the diffraction limit of 9.6 μm, and maintains the depth of focus, enabling detailed imaging of biological samples and biomedical research.
Implementation Method 1
Resolution of optical microscopes is limited by diffraction, as explained by the theory of Fourier optics
Implementation Method 2
Laser scanning structured illumination microscopy and tomography (LSSIM/T) modulates laser scanning illumination temporally to create a controllable spatial pattern
Data Source
AI summary
Certain examples provide a structured illumination microscopy system. The example system includes a laser source to generate excitation illumination directed toward a target. The example system includes a modulator to modulate the excitation illumination temporally in a controllable spatial pattern to be constructed on the target object to provide sub-diffractional resolution in a lateral direction with respect to the target. The example system includes two synchronized laser scanning mirror units in confocal arrangement, the laser scanning units to be synchronized and controlled by a computing device, a first of the scanning mirror units to receive the modulated excitation illumination and project the modulated excitation illumination on the target object and a second of the scanning mirror units to receive emission fluorescence from the target and project the emission fluorescence. The example system includes a detector to collect emission fluorescence from the target via the second of the scanning mirror units.