Related Experiment Video
Updated: Jun 19, 2026
08:16
Visualizing Intracellular Sialylation with Click Chemistry and Expansion Microscopy
Published on: February 7, 2025
Breaking the diffraction resolution limit by stimulated emission: stimulated-emission-depletion fluorescence
Optics Letters
|October 22, 2009
Summary
This study introduces a novel scanning fluorescence microscope that achieves 35 nm resolution by inhibiting fluorescence in outer regions. This advanced optical microscopy technique enables 3D imaging of translucent samples, overcoming traditional diffraction limits.
Area of Science:
- Optics and Photonics
- Microscopy
- Biophysics
Background:
- The diffraction limit restricts the resolution of conventional far-field microscopes.
- Existing super-resolution microscopy techniques often involve complex sample preparation or near-field interactions.
Purpose of the Study:
- To develop a new scanning fluorescence microscope with enhanced resolution.
- To overcome the diffraction limit in far-field optical microscopy.
- To enable 3D imaging of translucent biological specimens.
Main Methods:
- Utilizing stimulated emission to suppress fluorescence.
- Modifying the excitation point-spread function.
- Implementing a scanning fluorescence microscopy approach.
Main Results:
- Achieved a spatial resolution of 35 nm.
- Successfully overcame the diffraction resolution limit.
- Demonstrated the capability for three-dimensional imaging of translucent specimens.
Conclusions:
- The proposed scanning fluorescence microscope offers a significant advancement in optical resolution.
- This method provides a viable alternative to near-field scanning optical microscopy for 3D imaging.
- The technique holds promise for detailed visualization of cellular and subcellular structures.
Related Concept Videos
01:37Super-resolution Fluorescence Microscopy
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
01:16Confocal Fluorescence Microscopy
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
01:25Overview of Electron Microscopy
The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.