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Related Experiment Video

Updated: Nov 10, 2025

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Plasmonic Split-Trench Resonator for Trapping and Sensing.

Daehan Yoo1, Avijit Barik1, Fernando de León-Pérez2,3

  • 1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States.

ACS Nano
|March 31, 2021
PubMed
Summary

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This summary is machine-generated.

This study introduces a novel split-trench resonator for on-chip plasmonics and electronics. This platform integrates biosensing and radio frequency (RF) nanogap tweezers for sensitive, label-free detection of nanoparticles and proteins.

Area of Science:

  • Plasmonics and Nanophotonics
  • Integrated Photonics
  • Biosensing Technologies

Background:

  • On-chip integration of plasmonics and electronics is crucial for advanced applications.
  • A scalable chip-manufacturing method is essential for practical implementation.
  • Existing methods often lack the sensitivity or integration capabilities required.

Purpose of the Study:

  • To demonstrate a novel split-trench resonator platform.
  • To integrate a high-quality-factor plasmonic biosensor with radio frequency (RF) nanogap tweezers.
  • To enable chip-scale, label-free detection of analytes.

Main Methods:

  • Fabrication of split-trench cavity resonators using photolithography and atomic layer deposition.
  • Utilizing the resonator as a dielectrophoretic trap by applying an RF electrical bias.
Keywords:
Fano resonanceatomic layer lithographydielectrophoresisextraordinary optical transmissionplasmonicstrapping

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  • Employing refractive-index sensing via surface-plasmon standing waves for label-free detection.

    • Main Results:

    • Simultaneous trapping and sensing of analytes in a 10 nm gap.
    • Achieved label-free detection of nanoparticles and proteins down to 10 picomolar (pM) concentrations.
    • Demonstrated high-throughput manufacturing of centimeter-long resonators.

    Conclusions:

    • The split-trench resonator platform offers a viable solution for integrated plasmonics and electronics.
    • This technology enables sensitive, active sample concentration and label-free biosensing.
    • The scalable manufacturing method paves the way for practical applications in biosensing, spectroscopy, and optoelectronics.