Luminophore Imaging via Modulator Units
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Solution Overview
Problem
Current high-resolution imaging methods for structures with luminophores face challenges such as photochemical bleaching and limited switching operations due to the use of high-intensity luminescence-inhibiting light, which compromises the stability and longevity of the luminophores during imaging processes like GSD, RESOLFT, and STED microscopy.
Innovation Solution
A method that disturbs the electronic ground state of luminophores with luminescence-preventing light to reduce the absorption cross-section for luminescence excitation light by at least 50%, preventing photochemical bleaching and allowing high-speed scanning without changing the luminophore's electronic state, using modulator units like azo dyes or crystal violet to transfer movement impulses and vibrations, thereby reducing the excitation probability and minimizing thermal equilibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-intensity luminescence-inhibiting light is used to achieve high spatial resolution imaging, then imaging resolution is improved, but photochemical bleaching of luminophores increases
Solution Approach 1:
The patent changes the fundamental parameter of how luminescence inhibition is achieved - instead of using high-intensity light to deplete ground state or stimulate emission, it uses low-intensity light to induce cis-trans isomerization of modulator units. This parameter change in the mechanism of action allows resolution improvement without the harmful high-intensity light exposure that causes bleaching
Solution Approach 2:
The patent introduces modulator units (azobenzene or crystal violet groups) as intermediary elements that mediate between the luminescence-inhibiting light and the luminophore. These modulator units absorb the inhibition light and transfer a steric effect to the luminophore, preventing direct exposure of the luminophore to high-intensity light while still achieving luminescence inhibition outside the focal spot
2Measurement precision
If luminescence-inhibiting light is used to deplete ground state or stimulate emission, then spatial resolution is improved, but the number of usable switching operations is limited
Solution Approach 1:
The patent employs periodic switching between cis and trans isomeric states of the modulator units through alternating exposure to luminescence-inhibiting and luminescence-enabling light. This periodic action allows the luminophore to be repeatedly switched on and off without degradation, as the modulator units can undergo many isomerization cycles without photochemical damage
Solution Approach 2:
The patent uses modulator units that can be easily replaced or reset through light-induced isomerization. These modulator units act as disposable protective elements that can undergo many switching cycles, protecting the more valuable and sensitive luminophore from degradation while enabling prolonged imaging sessions
3Measurement precision
If high-intensity luminescence-inhibiting light is applied to narrow the excitation volume, then imaging resolution is improved, but thermal equilibration and photochemical damage increase
Solution Approach 1:
The patent replaces the thermal and photochemical mechanisms of high-intensity light with a mechanical/steric mechanism. The luminescence inhibition is achieved not through heating or photochemical reactions in the luminophore, but through the physical steric effect of cis-isomerized modulator units blocking the luminophore's luminescence capability, thereby avoiding thermal and photochemical damage
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 significantly reduces the risk of photochemical bleaching while maintaining high spatial resolution and speed, allowing for efficient imaging with minimal luminophore degradation and enabling simultaneous imaging of different structures with varying luminescent properties.
Implementation Method 1
the electronic ground state of the luminophore is disturbed with the luminescence-preventing light in such a way that the luminophore in the disturbed electronic ground state has an absorption cross section for the luminescence excitation light that is reduced by at least 50%
Implementation Method 2
using modulator units like azo dyes or crystal violet to transfer movement impulses and vibrations, thereby reducing the excitation probability
Implementation Method 3
the sample in the measurement area being exposed to luminescence excitation light that changes the luminophore from an electronic ground state excited out into a luminescent state
Data Source
Figure 1~2
Figure 3~4
Figure 5(a)~5(d)
AI summary
For the spatially high-resolved imaging of a structure (15) of a sample (12) that has a luminophore (6), the sample is subjected to an intensity distribution of luminescence inhibiting light (10) in a measurement range (13), which intensity distribution has a local minimum (14). The sample (12) is then subjected to luminescence excitation light (1) in the measurement range (13), which luminescence excitation light (1) excites the luminophore (6) from an electronic base state into a luminescent state, and luminescent light (2) emitted from the measurement range (13) is recorded. The luminescent light (2) recorded is assigned to the position of the local minimum (14) in the sample (12). The luminescent-inhibiting light (10) disrupts the electronic base state of the luminophore (6) such that the luminophore (6) has an absorption cross-section reduced by at least 50% for the luminescent excitation light (1) in the disrupted electronic base state.