Axially-Offset Differential Interference Contrast Correlation Spectroscopy
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Solution Overview
Problem
Current spectroscopy methods face challenges in generating intrinsic contrast from optically thin specimens like living cells and nanomaterials, with existing interferometric approaches being sensitive to environmental perturbations and requiring complex setups, while non-interferometric methods are time-consuming and underdetermined.
Innovation Solution
The method involves converting linearly polarized light into orthogonal polarized components, focusing them into separate focal planes to create a phase shift, and detecting the phase-shifted light to calculate phase and intensity, enabling phase contrasting-correlation spectroscopy without a reference beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interferometric approaches are used for quantitative phase imaging, then measurement precision is improved, but device complexity increases and sensitivity to environmental perturbations worsens
Solution Approach 1:
The patent extracts and eliminates the reference beam from the interferometric system, retaining only the object beam that passes through the sample. This removes the need for beam splitting and recombination optics, significantly simplifying the device while maintaining the ability to measure quantitative phase information through correlation spectroscopy of the transmitted light
Solution Approach 2:
The patent makes the system compatible with existing microscopy systems by using standard optical components and detection methods. The approach can be integrated into conventional transmission microscopy setups, allowing the same system to perform both standard imaging and quantitative phase measurements without requiring specialized interferometric hardware
2Measurement precision
If interferometric approaches are used for quantitative phase imaging, then measurement precision is improved, but reliability under environmental conditions worsens
Solution Approach 1:
By removing the reference beam that travels through a separate optical path, the patent eliminates the primary source of environmental sensitivity. The object beam passes through the sample and is directly detected, so environmental perturbations affecting external optical paths do not impact the measurement, greatly improving reliability in practical conditions
3Device complexity
If non-interferometric approaches are used, then device complexity is reduced, but productivity worsens due to time-consuming acquisition and processing
Solution Approach 1:
The patent employs temporal modulation of the incident light polarization state using a rotating half-wave plate or electro-optic modulator. This periodic modulation encodes phase information into intensity variations at specific frequencies, enabling rapid acquisition of correlation spectroscopy data that can be processed in real-time, greatly improving productivity compared to static non-interferometric methods
4Device complexity
If non-interferometric approaches are used, then device complexity is reduced, but measurement precision worsens due to underdetermined images
Solution Approach 1:
The patent uses correlation spectroscopy to analyze temporal fluctuations in the transmitted light intensity. By computing the autocorrelation function of the intensity signal and comparing it with theoretical models of particle diffusion, the system extracts quantitative phase information and particle size distributions with high precision, overcoming the underdetermined nature of non-interferometric measurements
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 allows for sensitive and quantitative phase contrast imaging of nanocrystal suspensions, providing accurate particle size distributions and refractive index measurements without the need for a reference beam, enhancing compatibility with existing microscopy systems and reducing sensitivity to environmental changes.
Implementation Method 1
converting an incident linearly polarized light into two polarized components. The two polarized components include a polarized divergent component, and a polarized convergent component
Implementation Method 2
focusing each of the polarized divergent component and the polarized convergent component into a focal plane, thereby producing two focus planes constituting a reference focus (RF) plane and a sample focus (SF) plane
Implementation Method 3
resulting in a phase shift between the two polarized components
Implementation Method 4
detecting the phase-shifted linearly polarized light by a detector, and calculating phase and intensity of the sample from the phase-shifted linearly polarized light
Data Source
AI summary
A method for phase contrasting-correlation spectroscopy: converting an incident linearly polarized light into two polarized components (polarized divergent and convergent components, wherein the polarized divergent component is orthogonal to the polarized convergent component), focusing each of the polarized divergent component and the polarized convergent component into a focal plane, thereby producing two focus planes constituting a reference focus (RF) plane and a sample focus (SF) plane; placing a sample at the SF plane and ambient conditions of the sample at the RF plane, resulting in a phase shift between the two polarized components; reconstituting the two phase-shifted polarized components into a phase-shifted linearly polarized light; detecting the phase-shifted linearly polarized light; calculating phase and intensity of the sample from the phase-shifted linearly polarized light; establishing an autocorrelation of phase and intensity of the phase-shifted linearly polarized light; and generating correlograms of intensity and phase of the phase-shifted linearly polarized light.