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Related Experiment Video

Updated: Jun 16, 2026

Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Optimized optical trapping of gold nanoparticles.

Faeghe Hajizadeh1, S Nader S Reihani

  • 1Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran.

Optics Express
|February 23, 2010
PubMed
Summary

Researchers achieved stable 3-D trapping of gold nanospheres using significantly lower laser power, a breakthrough for optical tweezers applications. This advancement enables precise manipulation of nanoparticles for advanced optical and biological studies.

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Area of Science:

  • Nanotechnology
  • Optical Physics
  • Biophysics

Background:

  • Metallic nanoparticles, particularly gold nanospheres, are crucial for optical and biological applications.
  • Optical tweezers are a key technology for manipulating micro- and nanoparticles.

Purpose of the Study:

  • To demonstrate stable 3-D trapping of gold nanospheres using reduced laser power.
  • To validate theoretical models for nanoparticle trapping and force generation.

Main Methods:

  • Utilized optical tweezers to trap gold nanospheres ranging from 5.4nm to 254nm.
  • Employed substantially decreased laser power compared to previous studies.
  • Measured the maximum applicable force exerted by the optical trap.

Main Results:

  • Achieved stable 3-D trapping with laser power approximately two times lower than previously reported.
  • Successfully trapped 5.4nm gold nanospheres for 2-3 seconds.
  • Verified the volume-corrected Rayleigh model for nanoparticles under 100nm.
  • Demonstrated that low milliwatt laser power can generate pico-Newton forces.

Conclusions:

  • Stable 3-D trapping of gold nanospheres is feasible with significantly reduced laser power.
  • The findings validate theoretical models and expand the capabilities of optical tweezers for nanoparticle manipulation.
  • This research paves the way for enhanced in vivo micro-manipulation and advanced applications.

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Last Updated: Jun 16, 2026

Optical Trapping of Nanoparticles
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Published on: January 15, 2013

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