Hyperspectral Imaging via Spatial Light Modulator Dispersion
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Solution Overview
Problem
Current microscopy techniques face limitations in efficiently determining spectrographic information, particularly at the micro-scale, as they often require extensive light exposure, which can cause photobleaching and fail to provide high spatial and temporal resolution while accurately distinguishing spectral properties of targets.
Innovation Solution
The implementation of a spatial light modulator (SLM) with an electronically controllable refractive index, capable of chromatic dispersion, is used to spectrally disperse light from a target, allowing for hyperspectral imaging and precise determination of spectrographic information by controlling the refractive index gradient across the SLM to optimize spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional microscopy techniques are used to determine spectrographic information, then spatial resolution can be achieved, but extensive light exposure is required causing photobleaching and reducing temporal resolution
Solution Approach 1:
The patent segments the spectrographic measurement process into multiple sequential measurements at different wavelengths. Instead of using broad-spectrum illumination that requires high light exposure, the system sequentially measures absorption, emission, and excitation spectra at specific wavelength ranges, accumulating spectrographic information over time while minimizing peak light exposure to prevent photobleaching.
Solution Approach 2:
The system employs periodic action by sequentially cycling through different wavelength measurements and spectral modes (absorption, emission, excitation). This periodic measurement approach allows the detector to integrate signals over multiple cycles, improving spectrographic accuracy without requiring continuous high-intensity illumination that would cause photobleaching.
2Measurement precision
If conventional microscopy techniques are used, then spatial resolution can be achieved, but temporal resolution is reduced due to extensive light exposure requirements
Solution Approach 1:
The measurement process is segmented into discrete spectral components (absorption, emission, excitation) measured in sequence. This segmentation allows efficient use of detector integration time for each spectral component, improving temporal resolution compared to continuous broad-spectrum measurement while maintaining spectrographic accuracy through cumulative data collection.
Solution Approach 2:
The system maintains continuous useful action by seamlessly cycling through different spectral measurements without interruption. The detector continuously integrates signals across multiple wavelength cycles, ensuring that spectrographic information accumulates efficiently over time while minimizing idle periods, thus improving temporal resolution.
3Measurement precision
If conventional microscopy techniques are used, then imaging can be performed, but the ability to distinguish spectral properties is insufficient
Solution Approach 1:
The patent implements a multi-functional imaging system where a single detector and optical path can perform multiple spectral measurement modes (absorption, emission, excitation spectroscopy). By using a spatial light modulator to dynamically configure the optical path and a single detector to integrate multiple spectral signals, the system achieves comprehensive spectral property distinction without requiring separate imaging systems for each spectral mode, thus managing device complexity.
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 high-resolution, low-light exposure imaging, preventing photobleaching and allowing for accurate identification of spectral properties, such as emission, excitation, and absorption spectra, thereby enhancing the ability to analyze biological tissues and other materials at the micro-scale.
Implementation Method 1
The implementation of a spatial light modulator (SLM) with an electronically controllable refractive index, capable of chromatic dispersion, is used to spectrally disperse light from a target
Implementation Method 2
spatial light modulator (SLM) with an electronically controllable refractive index, capable of chromatic dispersion, is used to spectrally disperse light
Data Source
Figure 1
Figure 2A~2E
Figure 3A~3D
AI summary
An imaging system includes a light source configured to illuminate a target and a camera configured to image light responsively emitted from the target and reflected from a spatial light modulator (SLM). The imaging system is configured to generate high-resolution, hyperspectral images of the target. The SLM includes a refractive layer that is chromatically dispersive and that has a refractive index that is controllable. The refractive index of the refractive layer can be controlled to vary according to a gradient such that light reflected from the SLM is chromatically dispersed and spectrographs information about the target can be captured using the camera. Such a system could be operated confocally, e.g., by incorporating a micromirror device configured to control a spatial pattern of illumination of the target and to modulate the transmission of light from the target to the camera via the SLM according to a corresponding spatial pattern.