Variable-Index Optical Assembly for High-Resolution Deep Imaging
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Solution Overview
Problem
Existing microscopy techniques face limitations in achieving both high resolution and long working distance, particularly for imaging in-vivo dynamics of organisms or live specimens, with methods like structure illumination microscopy offering high resolution but limited working distance, and light sheet fluorescence microscopy providing long working distance but low resolution.
Innovation Solution
An assembly of optical elements comprising a light modulator, first and second polarization elements, and an optical element with varying refractive index, which actively and passively modulates light wavefronts to create precise illumination patterns, allowing for high resolution and long working distance imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If structure illumination microscopy is used to achieve high resolution, then imaging resolution is improved, but working distance is limited
Solution Approach 1:
The system segments the illumination function by using multiple independent light modulators (spatial light modulators) to generate multiple independent light sheets that can be focused at different depths. This allows high-resolution imaging at various depths without requiring the entire optical path to be at high numerical aperture, thus maintaining working distance.
Solution Approach 2:
The patent introduces a temporal dimension by sequentially switching between multiple light modulators and their corresponding light sheets. This allows the system to achieve high resolution at different depths over time, effectively trading temporal multiplexing for spatial resolution without compromising working distance.
2Length of moving object
If light sheet fluorescence microscopy is used to achieve long working distance, then working distance is improved, but imaging resolution is reduced
Solution Approach 1:
The illumination is segmented into multiple discrete light sheets, each generated by a separate light modulator. Each light sheet can be independently focused at a specific depth, allowing the system to maintain long working distance while achieving high resolution at the focal plane of each light sheet.
Solution Approach 2:
The system applies local quality by ensuring that only the specific depth of interest is illuminated with a focused light sheet at high numerical aperture, while other regions remain at lower illumination intensity. This allows high resolution locally at the focal plane while maintaining long working distance globally.
3Adaptability or versatility
If multiple light modulators are used to illuminate different depths, then imaging capability at larger depths is improved, but device complexity increases
Solution Approach 1:
The system merges multiple light modulators and their control functions into a single integrated assembly that couples to the microscope objective. This consolidation reduces the overall complexity compared to having separate illumination systems for each depth, while still providing multi-depth imaging capability.
Solution Approach 2:
Each light modulator in the assembly is designed to be multi-functional, capable of generating light sheets at different orientations and depths. This universality reduces the need for specialized components for each depth, thereby reducing overall device complexity while maintaining versatile imaging 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
The assembly enables high-resolution imaging at larger depths within biological tissues with diffraction-limited performance, enhancing image acquisition speed and stability, and supports image reconstruction with doubled resolution compared to conventional microscopes.
Implementation Method 1
a light modulator configured to actively modulate a wavefront of light passing though the assembly
Implementation Method 2
a first polarization element configured to define a polarization of the light received from the light modulator
Implementation Method 3
an optical element that has a region across which a value of a refractive index of the optical element varies for passively modulating the wavefront of the light received from the first polarization element
Implementation Method 4
a second polarization element configured to define the polarization of the light received from the optical element
Data Source
AI summary
An assembly of optical elements for the control of light has a light modulator, a first polarization element, an optical element, and a second polarization element. The light modulator has an electronic interface and is configured to actively modulate a wavefront of light passing through the assembly. The first polarization element is configured to define a polarization of the light received from the light modulator. The optical element has a region across which a value of a refractive index of the optical element varies for passively modulating the wavefront of the light received from the first polarization element. The second polarization element is configured to define the polarization of the light received from the optical element.