Tilted Micro Mirror Array for Parallel Axial Imaging
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Solution Overview
Problem
Conventional optical microscopy faces a significant disparity in lateral and axial imaging speeds, with slow mechanical scanning in the axial direction hindering the ability to image fast processes, and existing methods like multi-focal imaging and holography lack optical sectioning capability in scanning fluorescence microscopy.
Innovation Solution
The use of an array of tilted micro mirrors along the axial direction to orthogonally reflect and spatially separate image signals from different axial positions, allowing for parallel detection and achieving nearly diffraction-limited axial resolution through a micro-mirror array (MMA), which converts axial imaging into a lateral imaging problem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical scanning of the objective lens or specimen is used in the axial direction, then optical sectioning capability is achieved, but imaging speed in the z direction becomes slow
Solution Approach 1:
The invention divides the axial imaging problem into multiple parallel detection channels by using an array of tilted mirrors. Each mirror element corresponds to a specific axial position, allowing simultaneous detection of multiple axial planes without mechanical scanning. This segmentation of the detection function enables parallel processing of axial information.
Solution Approach 2:
The invention transforms the axial (z-direction) imaging problem into a lateral (x-direction) detection problem by using tilted mirrors to map different axial positions to different lateral positions on the detector array. This dimensional transformation allows fast lateral detectors to capture axial information at high speed.
2Productivity
If multiple cameras with different distances are used to image different conjugate planes, then multi-focal imaging is achieved, but optical sectioning capability is lost
Solution Approach 1:
Each tilted mirror element has a specific orientation that corresponds to a particular axial position, creating local optical sectioning at each detector element. This local quality assignment ensures that each detector pixel receives light only from its corresponding axial plane, maintaining optical sectioning while enabling multi-focal imaging.
3Speed
If chromatic scanning is used to accomplish effective axial scanning, then parallel spectroscopic detection is enabled, but fluorescence signals at different axial positions cannot be distinguished
Solution Approach 1:
The invention separates axial position information from wavelength information by mapping axial positions to lateral positions on the detector array through tilted mirrors. This allows spatial discrimination of axial positions independent of the spectral content, enabling both parallel detection and axial resolution 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 parallel axial imaging with optical sectioning capability, effectively increasing the z-imaging speed and enabling visualization of fast dynamic processes in three dimensions, as demonstrated by experimental results showing high aspect ratio micro-mirrors achieving diffraction-limited resolution and suppressing out-of-focus fluorescence signals.
Implementation Method 1
Image signals emitted from different axial positions can be orthogonally reflected by corresponding micromirrors and spatially separated for parallel detection
Implementation Method 2
Use of these mirrors exploits the differences in the wavefronts of emitters at different axial positions, which can be de-multiplexed by using a micro-mirror array (MMA). Each micro mirror also provides optical sectioning capability due to its finite dimension.
Implementation Method 3
focusing the imaging signals on a micro mirror array
Data Source
AI summary
We present a method for parallel axial imaging, or z-microscopy, utilizing an array of tilted micro mirrors arranged along the axial direction. Image signals emitted from different axial positions can be orthogonally reflected by the corresponding micro mirrors and spatially separated for parallel detection, essentially converting the more challenging axial imaging to a lateral imaging problem. Each micro mirror also provides optical sectioning capability due to its finite dimension.