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Updated: Nov 2, 2025

Optical Trapping of Nanoparticles
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Optical Trapping with Focused Surface Waves.

Yifeng Xiang1, Xi Tang1, Changjun Min2

  • 1Department of Optics and Optical Engineering, Institute of Photonics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Annalen Der Physik
|June 11, 2021
PubMed
Summary

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This summary is machine-generated.

Focused plasmonic waves trap more beads than evanescent waves due to photothermal effects. This study compares near-field optical trapping techniques for enhanced particle manipulation.

Area of Science:

  • Physics
  • Optics
  • Nanotechnology

Background:

  • Near-field optical trapping utilizes focused evanescent or plasmonic waves.
  • Total internal reflection at water-glass interfaces excites evanescent waves.
  • Surface plasmon polaritons at water-gold interfaces excite plasmonic waves.

Purpose of the Study:

  • Compare the performance of evanescent and plasmonic near-field optical trapping.
  • Analyze the trapping behavior differences based on electric field intensity and photothermal effects.
  • Investigate the potential for simultaneous trapping of multiple microparticles.

Main Methods:

  • Utilized a single optical microscope configuration for both trapping methods.
  • Excited focused evanescent waves at a water-glass interface.
Keywords:
evanescent wavesoptical trappingoptothermal effectssurface plasmonsthermal convection

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  • Excited focused plasmonic waves at a water-gold interface.
  • Analyzed electric field intensity distributions of the focused surface waves.

    • Main Results:

    • Evanescent waves trapped only a single micron-sized polystyrene bead.
    • Plasmonic waves simultaneously attracted multiple beads to the excitation center.
    • Differences attributed to electric field intensity and light absorption by the gold film.
    • Photothermal effects significantly influence plasmonic trapping behavior.

    Conclusions:

    • Plasmonic near-field optical trapping offers superior capacity for trapping multiple microparticles compared to evanescent waves.
    • Photothermal effects induced by gold film absorption are crucial for enhanced plasmonic trapping.
    • Understanding these differences enables optimization of optical trapping techniques for various applications.