Phase Mask Light-Field Microscopy Uniform Resolution
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Solution Overview
Problem
Light field microscopy suffers from non-uniform spatial resolution across different depths, leading to reduced imaging quality and loss of resolution, particularly around the native object plane, which affects applications such as in-vivo calcium imaging and single-molecule tracking.
Innovation Solution
The implementation of phase masks in the optical path of a light field microscope, specifically at the objective lens and microlens array, alters the phase characteristics of light, enhancing spatial resolution and creating a uniform resolution profile across depths by shaping the point spread function and diffraction pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase masks are added to alter phase characteristics of light, then spatial resolution at native object plane is improved, but device complexity increases
Solution Approach 1:
A phase mask is introduced as an intermediary optical element in the light path between the objective lens and microlens array. This phase mask modifies the phase characteristics of light waves without significantly altering the overall system structure, thereby improving spatial resolution while maintaining relative system simplicity
Solution Approach 2:
The phase mask changes the phase parameter of light waves passing through it, creating controlled phase shifts that modify the point spread function and improve spatial resolution. This parameter change approach allows resolution enhancement without adding complex mechanical or electronic components
2Loss of information
If microlens array records many ray angles, then angular information is improved, but lateral spatial resolution deteriorates
Solution Approach 1:
The phase mask introduces phase shifts that modify how light from different angles is distributed across the sensor. By changing the phase parameter of light waves, the system can record angular information while the phase modulation compensates for the spatial resolution loss that would otherwise occur
Solution Approach 2:
The phase mask operates in the phase dimension of light, adding a fourth dimension (phase) to the traditional three-dimensional spatial information. This allows the system to encode angular information in the phase domain while preserving spatial resolution in the amplitude domain
3Measurement precision
If uniform spatial resolution is achieved across z-depths, then imaging quality is improved, but loss of resolution at native object plane is eliminated
Solution Approach 1:
The phase mask applies depth-dependent phase shifts that compensate for the natural degradation of spatial resolution at different z-depths. By modifying the phase parameter as a function of depth, the system achieves uniform resolution across the imaging volume and recovers resolution at the native object plane
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 improves lateral spatial resolution at the native object plane and across z-depths, enabling more accurate imaging and tracking of objects with consistent resolution, addressing the limitations of non-uniform resolution in light field microscopy.
Implementation Method 1
a phase mask component that alters a phase characteristic of light travelling in a path from a specimen through an objective lens and a microlens element
Implementation Method 2
The microlens array decomposes incoming light, focusing it onto the image sensor so that light at different field positions and ray angles are recorded by separate sensor pixels
Implementation Method 3
light rays travelling in a path from a specimen through an objective lens and a microlens element
Data Source
AI summary
Various aspects of the present disclosure are directed toward optics and imaging. As may be implemented with one or more embodiments, an apparatus includes one or more phase masks that operate with an objective lens and a microlens array to alter a phase characteristic of light travelling in a path from a specimen, through the objective lens and microlens array and to a photosensor array. Using this approach, the specimen can be imaged with spatial resolution characteristics provided via the altered phase characteristic, which can facilitate construction of an image with enhanced resolution.