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Super-resolution Fluorescence Microscopy

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Related Experiment Video

Updated: Jun 8, 2026

Fluorescence Imaging with One-nanometer Accuracy (FIONA)

Fluorescence Imaging with One-nanometer Accuracy (FIONA)

Published on: September 26, 2014

Far-field autofluorescence nanoscopy.

Jakob Bierwagen¹, Ilaria Testa, Jonas Fölling

¹Max Planck Institute for Biophysical Chemistry, Department of NanoBiophotonics, Am Fassberg 11, 37077 Gttingen, Germany.

|September 14, 2010

Summary

This summary is machine-generated.

Researchers achieved nanoscale optical imaging without labels. This technique uses a novel method to visualize autofluorescent biological samples at subdiffraction resolution, enabling detailed study of cellular structures.

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Area of Science:

Optical microscopy
Nanotechnology
Biophysics

Background:

Conventional optical microscopy is limited by the diffraction of light, preventing imaging at the nanoscale.
Existing super-resolution techniques often require fluorescent labeling, which can perturb biological samples.
Autofluorescence from biological molecules presents an opportunity for label-free imaging but is challenging to resolve.

Purpose of the Study:

To develop a far-field optical imaging method capable of achieving nanoscale resolution without the need for exogenous labels.
To visualize the fine structures of autofluorescent biological samples at the subdiffraction level.
To demonstrate the applicability of the developed technique on complex biological systems.

Main Methods:

Utilized a technique based on stochastic single-molecule switching, exploiting the natural fluorescence properties of samples.
Induced a metastable dark state in natural fluorophores by depleting their ground state.
Localized fluorophores returning transiently from the dark state, enabling image reconstruction with high resolution.

Main Results:

Achieved subdiffraction resolution imaging of autofluorescent samples.
Successfully recorded label-free nanoscopy images of thylakoid membranes within spinach chloroplasts.
Demonstrated that the method requires only a single fluorescence on-off cycle, a condition met by many biomolecules.

Conclusions:

The developed far-field optical imaging method provides nanoscale resolution for unlabeled samples.
This label-free nanoscopy approach is suitable for studying the intricate structures of biological specimens.
The technique offers a new avenue for high-resolution imaging of native biological systems without perturbation.