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Related Experiment Video

Updated: Jun 13, 2026

Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Two-photon quantum dot excitation during optical trapping.

Liselotte Jauffred1, Lene B Oddershede

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

Nano Letters
|April 21, 2010
PubMed
Summary

A single infrared laser can now trap and excite quantum dots via two-photon absorption. This simplifies nanoscale experiments by removing the need for a separate excitation light source.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Simultaneous optical trapping and excitation of nanomaterials are crucial for advanced nanoscale experiments.
  • Current methods often require separate laser systems for trapping and excitation, increasing experimental complexity.
  • Colloidal quantum dots (CQDs) are promising nanomaterials for various applications due to their unique optical properties.

Purpose of the Study:

  • To investigate the feasibility of using a single continuous-wave (CW) infrared laser for simultaneous trapping and excitation of individual colloidal quantum dots (CQDs).
  • To explore the underlying excitation mechanism, specifically two-photon absorption (TPA).
  • To determine if optical trapping efficiencies correlate with CQD properties like emission wavelength or physical size.

Main Methods:

  • Utilizing a single CW infrared laser to optically trap individual CQDs.
  • Analyzing the excitation mechanism through spectroscopic measurements, confirming two-photon absorption.
  • Measuring optical trapping forces and CQD emission characteristics.
  • Correlating trapping efficiency with CQD emission wavelength and size.

Main Results:

  • Demonstrated simultaneous optical trapping and excitation of individual CQDs with a single CW infrared laser.
  • Confirmed that excitation occurs via two-photon absorption, even with relatively weak laser power.
  • Showed that optical trapping efficiencies are independent of CQD emission wavelength and physical size.
  • Eliminated the need for a separate excitation light source in combined trapping-visualization experiments.

Conclusions:

  • A single CW infrared laser can efficiently trap and excite individual CQDs through two-photon absorption, simplifying experimental setups.
  • This approach enables simultaneous force manipulation and visualization of CQDs at the nanoscale.
  • The findings suggest that CQD selection for trapping-based applications can focus on desired optical properties without compromising trapping efficiency based on size or emission color.

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