Nanosilver-Enhanced Far-Field Fluorescence Fluctuations for Super-Resolution Microscopy

Area of Science:

• Optical Microscopy
• Nanotechnology
• Biophysics

Background:

• Fluctuation-based super-resolution microscopy (SRM) relies on signal fluctuations for enhanced resolution.
• Inherent fluorophore fluctuations limit the spatiotemporal resolution of conventional SRM techniques.
• Existing SRM methods face challenges in achieving both high temporal and spatial resolution simultaneously.

Purpose of the Study:

• To introduce a far-field enhancement (FFE) effect using a nanosilver film to boost fluorescence fluctuations.
• To develop a novel super-resolution microscopy technique, FFE-SRM, leveraging the FFE effect.
• To improve the spatiotemporal resolution of super-resolution imaging for live-cell applications.

Main Methods:

• Utilized a nanosilver film to induce a far-field enhancement (FFE) effect on fluorophore fluorescence.
• Investigated the FFE mechanism involving interference of scattered light and photothermal effects.
• Developed and applied far-field enhanced super-resolution microscopy (FFE-SRM) compatible with common fluorophores.

Main Results:

• Demonstrated significant boosting of fluorescence fluctuations up to 10 μm from the nanosilver film.
• Achieved up to a 10-fold improvement in temporal resolution and a 2-fold enhancement in spatial resolution compared to other SRM methods.
• Successfully visualized mitochondrial dynamics in live cells using FFE-SRM.

Conclusions:

• The FFE effect provides a powerful mechanism to enhance fluorescence fluctuations for super-resolution imaging.
• FFE-SRM offers superior spatiotemporal resolution, advancing the capabilities of live-cell super-resolution microscopy.
• This technique holds significant potential for exploring dynamic cellular processes with unprecedented detail.