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Related Experiment Video

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

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Three-dimensional optical control of individual quantum dots.

Liselotte Jauffred1, Andrew C Richardson, Lene B Oddershede

  • 1The Niels Bohr Institute, University of Copenhagen, Denmark.

Nano Letters
|September 5, 2008
PubMed
Summary

Individual quantum dots (QDs) are optically trapped and manipulated in 3D using low-power lasers. This breakthrough enables precise manipulation for single-molecule studies and quantifies forces and polarizability.

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Last Updated: Jul 2, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Production and Targeting of Monovalent Quantum Dots
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Published on: October 23, 2014

Compact Quantum Dots for Single-molecule Imaging
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Area of Science:

  • Nanotechnology
  • Quantum Optics
  • Materials Science

Background:

  • Quantum dots (QDs) are semiconductor nanocrystals with unique optical properties.
  • Optical trapping is a technique used to hold microscopic objects with a focused laser beam.
  • Single-molecule experiments require precise manipulation and visualization tools.

Purpose of the Study:

  • To demonstrate the optical trapping and 3D manipulation of individual cadmium selenide (CdSe)-core quantum dots.
  • To explore the potential of quantum dots as tools for manipulation in single-molecule experiments.
  • To quantitatively determine the forces and polarizability of single quantum dots during optical trapping.

Main Methods:

  • Utilizing a continuous wave infrared laser for optical trapping.
  • Operating the laser at low power to ensure gentle manipulation.
  • Employing 3D optical trapping techniques to control quantum dot position.

Main Results:

  • Successfully demonstrated stable 3D optical trapping of individual CdSe-core quantum dots.
  • Achieved manipulation of quantum dots at low laser powers, minimizing photodamage.
  • Provided quantitative measurements of the forces exerted on and the polarizability of single quantum dots.

Conclusions:

  • Individual quantum dots can be precisely manipulated in three dimensions using optical trapping.
  • Optical trapping of quantum dots offers significant advantages for single-molecule experiments, combining visualization and manipulation.
  • The study provides crucial quantitative data on forces and polarizability, advancing the understanding of light-matter interactions at the nanoscale.