Electro-Optical Modulator Light Shifting Microscopy
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Solution Overview
Problem
Current methods for shifting light intensity distributions in microscopy, such as STED fluorescence microscopy, face limitations in velocity and precision due to the use of scanners with moving mirrors and spatial light modulators that cannot change modulation patterns at high frequencies.
Innovation Solution
A method and apparatus that direct coherent input light into non-identical pupil areas of an objective lens, using separate electro-optical modulators to independently modulate each portion of the light, allowing for high-frequency and precise control of phase and amplitude to shift and form light intensity distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scanners with moving mirrors are used to shift light intensity distributions, then positioning flexibility is improved, but shifting velocity deteriorates
Solution Approach 1:
The patent replaces mechanical scanning systems with moving mirrors with an electro-optical modulation system. By using electro-optical modulators to directly modulate the phase and amplitude of light portions in the pupil plane, the system achieves rapid shifting of light intensity distributions without mechanical moving parts, thereby resolving the contradiction between positioning flexibility and shifting velocity.
2Adaptability or versatility
If spatial light modulators are used to form light intensity distributions, then pattern adaptability is improved, but modulation frequency deteriorates
Solution Approach 1:
The patent substitutes spatial light modulators with electro-optical modulators that operate at higher frequencies. The electro-optical modulators directly modulate the optical properties of light portions without the mechanical or liquid crystal limitations of spatial light modulators, enabling both high pattern adaptability through programmable modulation and high modulation frequencies suitable for dynamic microscopy applications.
3Measurement precision
If discrete portions of light are separately modulated using separate electro-optical modulators, then shifting precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the light beam into multiple discrete portions in the pupil plane and assigns separate electro-optical modulators to each portion. This segmentation enables independent control of phase and amplitude for each light portion, achieving high precision in shaping and shifting light intensity distributions. The complexity is managed by the modular nature of the system, where each modulator handles a specific portion independently.
Solution Approach 2:
The patent operates in the pupil plane (Fourier space) rather than directly in the image plane, adding a dimensional transformation to the control approach. By modulating light portions in the pupil plane, the system achieves precise control over the light intensity distribution in the image plane through Fourier transform relationships, improving shifting precision while maintaining manageable device complexity.
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 very high velocity and precision in shifting light intensity distributions, with the ability to adapt quickly to multiple wavelengths, improving spatial resolution in microscopy applications like MINFLUX microscopy.
Implementation Method 1
separate electro optical modulators for separately modulating one discrete portion of the plurality of portions of coherent input light
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
For forming and shifting a light intensity distribution (2, 3) in a focal area (4) of an objective lens (5), a plurality of discrete portions (7-10) of coherent input light are directed into a plurality of non- identical pupil areas (11-14) of a pupil (15) of the objective lens (5); and at least one of the plurality of discrete portions (7-10) of coherent input light is separately modulated with regard to at least one of its phase and its amplitude by means of a separate electro optical modulator (22-25) which is by-passed by other portions of the plurality of discrete portions (7-10) of coherent input light.