Spatial Modulation of Illumination Microscope Resolution
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Solution Overview
Problem
Conventional microscopes face limitations in spatial resolution due to the finite dimensions of their aperture stop, which restricts the imaging of high spatial frequencies, making it difficult to observe features smaller than the Abbe limit.
Innovation Solution
The implementation of Spatial Modulation of Illumination (SMI) in the illumination system of a microscope, using a spatial light modulator to shift high spatial harmonics outside the microscope's bandwidth, allowing their restoration through demodulation and enhancing the spatial resolution by expanding the microscope's effective bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microscope optics are used, then the imaging system is simple and easy to operate, but the spatial resolution is limited by the Abbe limit due to the finite aperture stop dimensions
Solution Approach 1:
A spatial light modulator is introduced as an intermediary component in the illumination system to generate spatial modulation patterns. This mediator shifts high spatial harmonics outside the microscope's bandwidth, allowing them to be captured and then restored through demodulation, thereby enhancing spatial resolution without requiring changes to the core microscope optics
Solution Approach 2:
The illumination system dynamically changes the spatial frequency parameters of the illumination light by applying different spatial modulation patterns. This parameter change allows the system to shift information about high spatial frequency object features into the passband of the microscope optics, enabling resolution beyond the conventional Abbe limit
2Measurement precision
If the aperture stop dimensions are increased to improve spatial resolution, then high spatial frequencies can be captured, but the device size and complexity increase
Solution Approach 1:
Instead of physically increasing the aperture stop dimensions, the system changes the spatial frequency parameters of the illumination light through spatial modulation. This allows high spatial frequency information to be shifted into the existing bandwidth of the microscope optics, achieving enhanced resolution without increasing the physical size of the aperture stop
Solution Approach 2:
The patent replaces the mechanical approach of increasing aperture size with an optical modulation approach. By using spatial light modulation and digital demodulation, the system achieves equivalent效果 to a larger aperture without the associated increase in device size and complexity
3Measurement precision
If spatial modulation of illumination is applied to resolve smaller features, then the spatial resolution is enhanced, but the device complexity and processing requirements increase
Solution Approach 1:
The system employs a feedback loop where spatially modulated images are captured, demodulated using knowledge of the applied modulation pattern, and processed to restore high spatial frequency information. This feedback mechanism allows the system to iteratively refine the reconstructed image and achieve enhanced resolution despite the increased processing requirements
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
SMI enables microscopes to resolve objects 10% to 49% smaller than the Abbe limit, effectively improving the spatial resolution by allowing high spatial harmonics to be passed through and restored, enabling the imaging of smaller features.
Implementation Method 1
an illumination system for forming a spatial modulation pattern on an object to be imaged
Implementation Method 2
a microscope optics for imaging the spatially modulated object
Implementation Method 3
a spatial demodulator for performing a spatial demodulation which is at least partially matched to the spatial modulation pattern
Data Source
AI summary
A device for forming a high-resolution image of an object is provided. The device comprises: an electronic camera for capturing an intermediate image of the object, an illumination system for forming a spatial modulation pattern on the object; and a spatial demodulator for performing a spatial demodulation, which is at least partially matched to the spatial modulation pattern. A method for deriving a high-spatial-resolution image from a set of images captured from a structure of an object is derived, wherein the illumination of the object is spatially-modulated, wherein the illumination of the object has a spatial modulation pattern, which is substantially periodic, wherein one of at least one prevailing orientation of the periodic illumination is arranged substantially perpendicularly to at least one prevailing orientation of the structure of the object.