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Related Experiment Video

Updated: Aug 22, 2025

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Dynamically controllable plasmonic tweezers using C-shaped nano-engravings.

Mohammad Asif Zaman1, Lambertus Hesselink1

  • 1Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA.

Applied Physics Letters
|November 7, 2022
PubMed
Summary
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This study introduces plasmonic C-shaped nano-engravings for optical trapping. This novel method offers dynamic control over trapping forces and reduces thermal damage to sensitive specimens.

Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Tweezers

Background:

  • Near-field optical trapping offers high spatial resolution.
  • Plasmonic structures can enhance light-matter interactions.
  • Controlling trapping parameters dynamically is crucial for delicate samples.

Purpose of the Study:

  • To present a novel near-field optical trapping scheme using plasmonic C-shaped nano-engravings.
  • To demonstrate dynamic control over electric field, trapping force, and plasmonic heating.
  • To reduce thermal damage to sensitive specimens during optical trapping.

Main Methods:

  • Utilizing polarization sensitivity of C-shaped nano-structures.
  • Performing electromagnetic analysis and particle dynamics simulations.

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  • Fabricating the designed structure and conducting experimental testing with a half-wave plate for polarization control.

    • Main Results:

    • Successful experimental implementation of dynamically adjustable plasmonic tweezers.
    • Demonstration of polarization control over the optical trapping.
    • Validation of the proposed mechanism for dynamic control of trapping force and heating.

    Conclusions:

    • The plasmonic C-shaped nano-engraving scheme enables dynamic control of optical trapping.
    • Lower field strengths can be used for trapping, reducing photo-thermal effects.
    • This approach minimizes thermal damage, making it suitable for handling sensitive biological specimens.