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Super-resolution Fluorescence Microscopy

Super-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.

Confocal Fluorescence Microscopy

Confocal 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,...

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Related Experiment Video

Updated: May 14, 2026

Visualization of the Immunological Synapse by Dual Color Time-gated Stimulated Emission Depletion (STED) Nanoscopy

Visualization of the Immunological Synapse by Dual Color Time-gated Stimulated Emission Depletion (STED) Nanoscopy

Published on: March 24, 2014

Frequency dependent detection in a STED microscope using modulated excitation light.

Emiliano Ronzitti¹, Benjamin Harke, Alberto Diaspro

¹Nanophysics, Istituto Italiano di Tecnologia, Genova, Italy.

|February 8, 2013

Summary

This study introduces a new method for super-resolution imaging using intensity modulation and frequency-dependent detection. This technique expands compatible dyes for Stimulated Emission Depletion (STED) microscopy, improving imaging capabilities.

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Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

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Last Updated: May 14, 2026

Visualization of the Immunological Synapse by Dual Color Time-gated Stimulated Emission Depletion (STED) Nanoscopy

Visualization of the Immunological Synapse by Dual Color Time-gated Stimulated Emission Depletion (STED) Nanoscopy

Published on: March 24, 2014

Photostimulation by Femtosecond Laser Activates Extracellular-signal-regulated Kinase (ERK) Signaling or Mitochondrial Events in Target Cells

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Published on: July 6, 2019

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Area of Science:

Microscopy
Optical Imaging
Biophysics

Background:

Super-resolution microscopy techniques like STED offer enhanced resolution but are limited by compatible fluorescent dyes.
Conventional STED microscopy struggles with dyes whose spectral properties do not optimally interact with the depletion beam.

Purpose of the Study:

To present a novel, adaptable concept for Stimulated Emission Depletion (STED) microscopy.
To overcome limitations in compatible dyes for super-resolution imaging.
To enable STED imaging with a broader range of fluorescent probes.

Main Methods:

Implementation of an intensity-modulated excitation beam.
Utilizing frequency-dependent detection with a lock-in amplifier.
Developing a method to unmix fluorescence signals originating from different excitation sources.

Main Results:

Demonstrated successful super-resolution imaging of biological samples.
Successfully imaged fluorescent spheres with challenging spectral properties.
Validated the concept's compatibility with both continuous wave (CW) and pulsed STED microscopes.

Conclusions:

The developed concept significantly expands the range of compatible dyes for STED super-resolution imaging.
This approach offers a general improvement adaptable to existing STED microscope setups.
The method allows for effective unmixing of fluorescence signals, enhancing imaging quality and versatility.