Quantitative DIC Wavefront Sensor Eliminates Polarization Artifacts
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Solution Overview
Problem
Conventional Differential Interference Contrast (DIC) devices are limited by their inability to provide quantitative phase measurements due to entanglement of amplitude and phase information, and they rely on polarized light, leading to artifacts when imaging birefringent objects.
Innovation Solution
A quantitative DIC device with a wavefront sensor that measures amplitude and phase gradients in two orthogonal directions, allowing for the numerical reconstruction of the image wavefront and computation of depth sections using unpolarized light, thereby separating amplitude and phase information and eliminating polarization-dependent artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional DIC devices use polarized light to create interference patterns, then contrast for transparent samples is improved, but artifacts appear when imaging birefringent objects
Solution Approach 1:
The patent changes the fundamental parameter of illumination from polarized light to unpolarized light. This parameter change eliminates polarization-dependent artifacts while maintaining contrast through a different mechanism (wavefront sensing and numerical reconstruction rather than optical interference of polarized beams).
Solution Approach 2:
The patent replaces the optical interference mechanism (mechanical/optical system) with wavefront sensing and numerical computation (computational system). Instead of using polarized light interference to generate contrast, the system measures wavefront parameters and reconstructs images computationally, eliminating the need for polarized light and associated artifacts.
2Loss of information
If conventional DIC devices translate phase variations into amplitude variations through interference, then phase information is obtained, but amplitude and phase information become entangled and quantitative measurement is lost
Solution Approach 1:
The patent segments the measurement process into separate detection of amplitude and phase gradient components. By measuring these parameters independently through wavefront sensing, the system avoids entanglement and enables quantitative phase measurement through numerical reconstruction.
Solution Approach 2:
The patent introduces wavefront sensors as an intermediary device between the sample and detector. These sensors measure wavefront parameters (amplitude and phase gradients) without the interference entanglement problem, serving as a mediator that enables separate measurement of amplitude and phase information.
3Illumination intensity
If conventional DIC devices use optical interference to generate images, then contrast is achieved, but the devices become complex and expensive
Solution Approach 1:
The patent replaces complex optical interference mechanisms with wavefront sensing and numerical computation. This substitution simplifies the optical system by eliminating the need for precise polarization control and interference path matching, while achieving similar or superior contrast through computational methods.
Solution Approach 2:
The patent creates a computational copy of the optical interference process. Instead of physically interfering light beams to generate contrast, the system measures wavefront parameters and computationally reconstructs the interference pattern, simplifying the physical optics while maintaining the contrast-generating capability.
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 artifact-free imaging of both birefringent and homogenous objects by providing quantitative phase measurements and depth sectioning capabilities without the need for polarized light, resulting in more compact, cost-effective, and simpler DIC devices.
Implementation Method 1
The light detector at the back of the wavefront sensor measures the distribution of light passing through structured apertures in the wavefront sensor
Implementation Method 2
DIC microscopes render excellent contrast for optically transparent biological samples... The two light fields are allowed to interfere with each other at the image plane
Data Source
AI summary
Embodiments of the present invention relate to a method for computing depth sectioning of an object using a quantitative differential interference contrast device having a wavefront sensor with one or more structured apertures, a light detector and a transparent layer between the structured apertures and the light detector. The method comprises receiving light, by the light detector, through the one or more structured apertures. The method also measures the amplitude of an image wavefront, and measures the phase gradient in two orthogonal directions of the image wavefront based on the light. The method can then reconstruct the image wavefront using the amplitude and phase gradient. The method can then propagate the reconstructed wavefront to a first plane intersecting an object at a first depth. In one embodiment, the method propagates the reconstructed wavefront to additional planes and generates a three-dimensional image based on the propagated wavefronts.