Spatial Light Modulator Hyperspectral Confocal Microscope
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Solution Overview
Problem
Conventional confocal microscopy techniques face limitations in rapid image acquisition and efficient utilization of excitation light, particularly due to the use of Nipkow disks with fixed pinhole spacing and optical sectioning, which restricts the speed and flexibility of image acquisition.
Innovation Solution
The implementation of spatial light modulators (SLMs) to create programmable artificial pinholes and adjust the degree of optical sectioning, allowing for simultaneous illumination of multiple areas and efficient light utilization by modulating the phase or amplitude of excitation light to form customizable excitation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Nipkow disk with fixed pinholes is used for parallel scanning, then image acquisition speed is improved, but excitation light utilization efficiency deteriorates due to large spacing between pinholes
Solution Approach 1:
The patent replaces the static Nipkow disk with a spatial light modulator (SLM) that dynamically controls the position, size, and number of virtual pinholes. This allows the system to adapt pinhole spacing to match the excitation light distribution, maximizing light utilization while maintaining parallel scanning capability for fast image acquisition.
Solution Approach 2:
The SLM enables continuous adjustment of pinhole parameters (position, size, shape, number) to optimize the matching between excitation and detection pathways. By changing these parameters dynamically, the system achieves both high image acquisition speed and efficient light utilization without the fixed spacing constraints of physical pinhole arrays.
2Reliability
If a Nipkow disk with fixed pinhole spacing is used, then optical sectioning is maintained, but adaptability to different numerical apertures and optical sectioning degrees deteriorates
Solution Approach 1:
The SLM provides dynamic control over pinhole characteristics, allowing the system to adapt to different numerical apertures and optical sectioning requirements by programming the SLM pattern rather than physically changing disks. This maintains reliable optical sectioning while enabling versatile adaptation to various imaging conditions.
Solution Approach 2:
A single SLM device replaces multiple fixed Nipkow disks with different pinhole configurations. The SLM can be programmed to generate any pinhole pattern required for different objectives and imaging conditions, making the system universally adaptable without requiring physical hardware changes.
3Measurement precision
If point-by-point scanning with a spatial pinhole is used, then axial resolution is improved, but image acquisition speed deteriorates
Solution Approach 1:
The patent segments the detection field into multiple virtual pinholes across the focal plane, allowing parallel detection from multiple points simultaneously. This maintains the axial resolution benefits of confocal pinhole detection while achieving parallel imaging to overcome the slow acquisition speed of sequential point scanning.
Solution Approach 2:
The invention transitions from one-dimensional point-by-point scanning to two-dimensional parallel detection by distributing multiple virtual pinholes across the focal plane. This dimensional expansion enables simultaneous acquisition of multiple spatial locations while maintaining confocal optical sectioning and axial resolution.
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 faster and more efficient confocal imaging with adjustable optical sectioning, allowing for rapid acquisition of high-resolution images and hyperspectral datasets, improving throughput and flexibility compared to traditional methods.
Implementation Method 1
modulating the phase or amplitude of excitation light to form customizable excitation patterns
Implementation Method 2
modulating the phase or amplitude of excitation light to form customizable excitation patterns
Implementation Method 3
The excitation light source, usually a laser beam, is focused to a spot and scanned across the sample
Implementation Method 4
a second SLM configured to image emission light collected from a focal plane in the sample to the imaging device. The focal plane may be conjugate to a pinhole pattern formed by pixels of the second SLM
Implementation Method 5
In fluorescence microscopy, fluorophores or other optical labels in a sample are excited by an excitation light beam directed towards the sample. Upon excitation, the fluorophores emit fluorescent light that can be acquired as an image.
Data Source
AI summary
Systems and methods for confocal imaging are described. In one implementation, a confocal imaging system may include a light source configured to emit excitation light having one or more wavelengths, a sample holder configured to hold a sample, a two-dimensional (2-D) imaging device, a first set of optical elements, and a second set of optical elements. The first set of optical elements may include a first spatial light modulator (SLM) and at least one lens. The first set of optical elements may together be configured to collimate the excitation light, apply a predetermined phase modulation pattern to the collimated excitation light, and illuminate the sample in an excitation pattern.