3D Confocal Microscopy with Optical Tweezers
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Solution Overview
Problem
Combining confocal microscopy with optical tweezers for 3-dimensional observation poses a challenge as the conventional method affects the optical trap when vertically scanning the objective lens, making accurate manipulation of specimens using optical tweezers difficult.
Innovation Solution
A 3-dimensional confocal microscopy apparatus with a pair of lenses for focal plane displacement, a computer for real-time aberration correction, and a beam splitter or dichroic mirror to maintain the focal point of the optical tweezers unchanged during objective lens movement, allowing 3-dimensional imaging without affecting the optical trap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the objective lens is vertically scanned to achieve 3-dimensional observation, then the 3-dimensional imaging capability is improved, but the optical trap is affected and manipulation precision deteriorates
Solution Approach 1:
The optical system is segmented into two independent focal plane scanning units: one for confocal imaging and another for optical tweezers. Each unit has its own lens and detection system, allowing vertical scanning of the imaging lens without affecting the optical trap position. This segmentation enables simultaneous 3-dimensional imaging and precise manipulation by isolating the scanning operation from the manipulation function.
Solution Approach 2:
A beam splitter is introduced as an intermediary optical element to separate the confocal imaging light path from the optical tweezers light path. The beam splitter directs the excitation laser and fluorescent light from the confocal microscope while allowing the infrared laser for optical tweezers to pass through independently. This intermediary component enables both systems to operate simultaneously without mechanical coupling, resolving the contradiction between imaging scanning and manipulation stability.
2Measurement precision
If conventional confocal microscopy is used for 3-dimensional observation, then vertical relationship observation is improved, but the combination with optical tweezers introduces new drawbacks
Solution Approach 1:
The system achieves multi-functionality by integrating both confocal microscopy and optical tweezers capabilities into a single platform. The beam splitter enables the same optical path to serve dual purposes: confocal imaging for 3-dimensional observation and optical tweezers for manipulation. This universal design allows one system to perform multiple functions that would traditionally require separate apparatuses, reducing overall system complexity despite the advanced capabilities.
3Manufacturing precision
If the focal point of optical tweezers is maintained fixed during imaging, then manipulation accuracy is improved, but imaging coverage is limited
Solution Approach 1:
The system segments the optical paths so that the confocal imaging lens can be vertically scanned to cover different focal planes while the optical tweezers lens remains fixed. This segmentation allows the imaging function to explore a larger vertical coverage range independently of the manipulation function, which maintains a fixed focal point for high-precision work. Each subsystem operates with its own spatial freedom.
Solution Approach 2:
The system resolves the coverage limitation by utilizing the vertical dimension independently through the confocal imaging lens scanning mechanism. While the optical tweezers focal point remains fixed in the horizontal plane for manipulation accuracy, the confocal imaging system scans through the vertical dimension to provide comprehensive 3-dimensional coverage. This dimensional separation allows both requirements to be satisfied simultaneously.
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 accurate 3-dimensional imaging of specimens without moving the objective lens or the focal point of the optical tweezers, ensuring precise manipulation and high-speed acquisition of cross-sectional images.
Implementation Method 1
an excitation laser beam is focused and irradiated to a specimen (an object to be observed to which fluorescent staining is applied) through an objective lens
Implementation Method 2
a fluorescent light emitted from the specimen is made to pass through a pin hole arranged at a conjugated position with the objective lens and is imaged on a detector
Implementation Method 3
a pair of lenses for focal plane displacement is arranged between the objective lens and the fluorescent light imaging camera, the pair of lenses for focal plane displacement being constituted of an intermediate imaging lens which forms an intermediate image of the fluorescent confocal microscopy image of the specimen and an intermediate objective lens arranged such that a focal point of the intermediate objective lens overlaps with a focal point of the intermediate imaging lens on the same optical axis
Implementation Method 4
a beam splitter or a dichroic mirror is provided between the pair of lenses for focal plane displacement and the objective lens, and a second laser supplied from a light source for a second laser for optical tweezers passes through the objective lens via the beam splitter or the dichroic mirror
Implementation Method 5
a technique referred to as optical tweezers where a transparent micro bead is put into a liquid, the micro bead is captured at a focal point of a focused infrared laser beam
Data Source
AI summary
Provided is a 3-dimensional confocal microscopy apparatus which is manufactured by combining a confocal microscope and an optical tweezers technique, wherein a pair of lenses for focal plane displacement where one lens is movable in the optical axis direction is arranged between a fixed objective lens and a fluorescent light imaging camera, and the 3-dimensional confocal microscopy apparatus also includes a mean which corrects the aberration of a fluorescent confocal image obtained by the fluorescent imaging camera. Accordingly, it is possible to provide a 3-dimensional confocal microscopy apparatus which can acquire a 3-dimensional image of a specimen during a manipulation of the specimen using optical tweezers without affecting an optical trap.