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Super-resolution Fluorescence Microscopy01:37

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.

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Related Experiment Video

Updated: May 22, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Combining nanoscale manipulation with macroscale relocation of single quantum dots.

Francesca Paola Quacquarelli1, Richard A J Woolley, Martin Humphry

  • 1The Department of Physics and Astronomy, The Hicks Building, The University of Sheffield, Hounsfield Rd, Sheffield, South Yorkshire, S3 7RH, UK.

Beilstein Journal of Nanotechnology
|May 8, 2012
PubMed
Summary

Researchers precisely positioned single semiconductor quantum dots on a surface, enabling repeated optical measurements and controlled assembly of nanoparticle arrays.

Keywords:
automationnanoscale manipulationnanotechnologyquantum dotssingle molecule spectroscopy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Optics

Background:

  • Precise positioning of nanoparticles is crucial for advanced optical and electronic devices.
  • Existing methods lack the precision and reconfigurability needed for complex nanoparticle arrangements.

Purpose of the Study:

  • To develop a method for precise, repeatable positioning of single quantum dots.
  • To enable combined manipulation and spectroscopy of individual nanoparticles.
  • To facilitate the automated assembly of nanoparticle structures.

Main Methods:

  • Utilized a registration template for nanometre-precision positioning of Cadmium Selenide (CdSe) quantum dots.
  • Employed atomically flat sapphire substrates for optical measurements.
  • Developed automated routines for nanoparticle manipulation and imaging.

Main Results:

  • Achieved controllable, nanometre-precise positioning of single CdSe quantum dots on a macroscopic surface.
  • Demonstrated repeatable revisiting of nanoparticle locations.
  • Enabled combined manipulation-spectroscopy experiments on individual quantum dots.

Conclusions:

  • The developed technique allows for precise and repeatable placement of quantum dots.
  • This method facilitates the creation of custom nanoparticle arrangements for various applications.
  • The approach is suitable for advanced optical measurements and single-particle studies.